When consulting with mechanics about their best exhaust upgrade for the D40 Navara, one thing always stands out—reliable parts that handle heat and pressure without cracking or rattling loose. I’ve personally tested several options, and what impressed me most was how the Nissan Navara D22/D40/NP300 Exhaust Tips Muffler from YWGMGJND combined durability with style. The carbon fiber finish not only looks sharp but also withstands weather and road debris, making it an easy upgrade for those wanting a sleek, functional boost.
While the other options focus on internal components like intercooler hoses or EGR valves, this muffler enhances aesthetics and airflow while protecting your original exhaust from rust. It’s quick to install, with a secure screw mechanism, and noticeably improves the vehicle’s appearance. For real value, I recommend this for anyone wanting a balance of durability, style, and straightforward installation that really makes their Navara stand out.
Top Recommendation: Nissan Navara D22/D40/NP300 Exhaust Tips Muffler 2000-2025
Why We Recommend It: This product excels in combining long-lasting high-quality carbon fiber with simple, non-destructive installation, providing both protection and aesthetic appeal. Compared to other options, its robust material and adjustable fit address common durability issues while giving a visual upgrade.
Best exhaust for d40 navara: Our Top 5 Picks
- uxcell Car Turbocharger Intercooler Outer Hose – Best Value
- EGR Valve for Nissan D40, Navara R51, Pathfinder YD25 DCI – Best Premium Option
- Nissan Navara D22/D40/NP300 Exhaust Tips Muffler 2000-2025 – Best D40 Navara Exhaust Upgrade
- Motoforti Turbo Intercooler Hose Nissan Navara NP300 D40 D23 – Best Performance Exhaust for Navara D40
- Nissan Navara Engine & Exhaust Pressure Sensors 22365-5X00A – Best for Exhaust System Monitoring
uxcell Car Turbocharger Intercooler Outer Hose
- ✓ Durable heat-resistant material
- ✓ Easy installation
- ✓ Restores engine performance
- ✕ Slightly stiff out of the box
- ✕ Not universal fit
| Material | Heat-resistant, wear-resistant rubber or silicone composite |
| Compatibility | Nissan NAVARA NP300 D40 D23 (OE Number: 14463-4KV0A) |
| Function | Replace damaged turbocharger intercooler hose to restore engine performance and reduce black smoke |
| Temperature Resistance | Capable of withstanding high and low temperature fluctuations |
| Hose Diameter | Inferred to match OEM specifications for D40 Navara intercooler hose (exact size not specified) |
| Package Includes | 1x Turbocharger Intercooler Outer Hose |
Opening the box of the uxcell Car Turbocharger Intercooler Outer Hose, I immediately noticed its sturdy, heat-resistant material. It felt thick and flexible, yet tough enough to handle the engine bay’s harsh conditions.
Fitting it onto my Nissan NAVARA NP300 D40 was straightforward—no fuss with misalignments or tricky clamps.
During installation, I appreciated how well the hose sat snugly over the turbocharger outlet. It’s clearly designed for durability, withstanding high temperatures and pressure without cracking or deforming.
After securing it, I took my vehicle for a spin, eager to see if it would help with the black smoke issue I’d been battling.
The difference was noticeable. The engine ran smoother, and the exhaust looked cleaner.
This hose seems to do exactly what it promises—replacing that worn-out, heat-damaged pipe to restore performance. Plus, it’s made from a material that feels like it might last longer than the original OEM part.
After several weeks of use, I can say it’s a solid upgrade. It handles the heat well and stays in place even under demanding conditions.
For the price, it offers real value and peace of mind that the intercooler system is protected.
If you’re tired of black smoke and sluggish turbo performance, this hose could be a game-changer. It’s a simple fix with a big impact, especially if your existing hose shows signs of wear or cracking.
EGR Valve for Nissan D40, Navara R51, Pathfinder YD25 DCI
- ✓ Easy to install
- ✓ Rapid response operation
- ✓ Durable high-quality build
- ✕ Limited to specific models
- ✕ Might need calibration in some cases
| Material | High-temperature resistant and wear-resistant materials |
| Part Number Compatibility | [‘14710-EC00B’, ‘14710-EC00D’] |
| Application Vehicles | [‘Nissan D40’, ‘Navara R51’, ‘Pathfinder YD25 DCI’] |
| Design Features | Rapid opening and closing for precise exhaust gas flow control |
| Installation | Easy to install with compatible dimensions for various vehicle models |
| Operating Environment | Suitable for demanding engine environments over extended periods |
There’s a common myth that replacing an EGR valve is a hassle that doesn’t really make a difference. But after installing this one, I found that’s just not true.
The fitment is spot-on, and I was surprised how straightforward the installation was—no need for complex adjustments or extra parts.
What really stood out is how quickly the valve responds. It opens and closes almost instantly, which helps keep the engine running smoothly and efficiently.
I noticed a slight boost in power and a smoother idle right after installation, especially during city driving when the engine has to work harder.
The build quality feels robust; it’s made from high-temperature resistant materials that hold up well under demanding conditions. Even after a few weeks of use, I haven’t noticed any signs of wear or performance drops.
It’s clear this valve was engineered for durability, which is reassuring if you plan to keep your Navara or Pathfinder for the long haul.
Another thing I liked is the compatibility. It fits perfectly with my D40 Navara, and I didn’t have to tweak anything to get it working.
That’s a big plus if you’re not a mechanic or just want a hassle-free upgrade. Plus, at the price point, it delivers solid value for what you get.
Overall, this EGR valve effectively improves engine performance and longevity. It feels like a small part but makes a noticeable difference in how the vehicle runs.
If you’re aiming for better efficiency and a smoother ride, this is a smart choice.
Nissan Navara D22/D40/NP300 Exhaust Tips Muffler 2000-2025
- ✓ Durable carbon fiber finish
- ✓ Easy, non-destructive installation
- ✓ Protects exhaust pipe from rust
- ✕ Limited to aesthetic and protective benefits
- ✕ Not a performance upgrade
| Material | Durable carbon fiber |
| Compatibility | Nissan Navara D22, D40, NP300 (2000-2025) |
| Installation Mechanism | Adjustable screw bolt system for non-destructive fitting |
| Functionality | Protects exhaust pipe from weathering and rust, manages airflow, reduces heat around rear bumper |
| Design Features | Mirror finish shine, enhances vehicle aesthetics with a dynamic and sophisticated look |
Many people assume that any exhaust tip simply enhances the look of their vehicle without offering real protection or performance benefits. I’ve found that’s not always the case, especially with this Nissan Navara D22/D40/NP300 exhaust tip.
When I installed it, I immediately noticed how sturdy the carbon fiber material felt—solid but lightweight, with that sleek mirror finish that really catches the eye.
This exhaust tip isn’t just about looks, though; it actually helps shield the original exhaust pipe from dirt, weather, and rust. I tested it in different weather conditions, and it held up without any signs of corrosion or fading.
The adjustable screw bolt mechanism made installation straightforward—no drilling, no welding, just a simple twist to secure it tightly. It fits securely on the D40 Navara, and I appreciated how quick and fuss-free the process was.
The real bonus is how it adds a touch of sophistication to the rear end of the truck. The enhanced airflow management means less heat buildup near the bumper, which is great for longevity and safety.
Plus, it gives your vehicle a more aggressive, customized look that definitely turns heads. Whether you’re aiming for style or protection, this exhaust tip hits both marks without breaking the bank.
Overall, this is a smart upgrade for anyone wanting to improve their Navara’s appearance and durability. It feels well-made and performs exactly as promised.
Just keep in mind that it’s not a full exhaust system—so if you’re after serious sound or power gains, you’ll need more than this.
Motoforti Turbo Intercooler Hose Nissan Navara NP300 D40 D23
- ✓ Perfect fit for Navara
- ✓ Heat-resistant and durable
- ✓ Restores engine performance
- ✕ Limited to specific models
- ✕ No additional accessories included
| Material | Heat-resistant, wear-resistant rubber or silicone composite |
| Fitment | Nissan Navara NP300 D40 D23 |
| OE Number | 14463-4KV0A |
| Function | Replace turbocharger hose to restore engine performance and reduce black smoke |
| Temperature Resistance | High and low temperature stability |
| Package Contents | 1x Turbocharger Intercooler Outer Hose |
Imagine you’re crawling under your Nissan Navara NP300 D40, trying to figure out why the engine feels sluggish and there’s that annoying black smoke billowing out. You notice the original intercooler hose looks cracked and worn after years of heat and pressure.
That’s when you spot the Motoforti Turbo Intercooler Hose sitting ready to swap in.
Once you remove the old, brittle hose, you see how flexible and sturdy this new one feels. It’s made of heat-resistant material that can handle high temperatures without cracking or breaking.
The fitment is spot-on, matching the OE number 14463-4KV0A perfectly for your D40 or D23 model.
Installing it wasn’t complicated—just a quick fit, and it snugly sealed onto the turbocharger and intercooler connections. Immediately, I noticed smoother acceleration and a reduction in that black smoke.
It’s clear this hose does a great job resisting pressure and heat, helping restore your engine’s performance.
What really stood out is how well it holds up under the intense engine bay conditions. No signs of wear or brittleness after a few weeks of use.
Plus, at $37.40, it’s a solid investment to prevent future turbo issues or costly repairs.
If your Navara’s turbo hose is showing signs of age or damage, this Motoforti piece is a reliable, straightforward upgrade. It makes a noticeable difference in engine response and emissions, keeping your truck running smoothly.
Nissan Navara Engine & Exhaust Pressure Sensors 22365-5X00A
- ✓ Easy to install
- ✓ Reliable performance
- ✓ Affordable price
- ✕ Limited warranty period
- ✕ Basic plastic housing
| Part Number | 22365-5X00A, 42CP33-1, 223655X00A, 42CP331, 22365 5X00A |
| Type | Oil Pressure Sensor |
| Material | Plastic and metal |
| Fitment | Direct Replacement for Nissan D40 Navara |
| Warranty | 1 Year Manufacturer Warranty |
| Price | $15.99 |
Many people assume that replacing engine sensors like the Nissan Navara’s pressure sensors is a straightforward swap, but I’ve found that’s not always the case. The 22365-5X00A sensor feels deceptively simple, yet fitting it into a D40 Navara requires a bit of patience.
The first thing I noticed is its compact size and the multi-color plastic and metal housing. It’s lightweight but sturdy enough to handle engine bay conditions.
When I installed it, the fit was exact, thanks to the direct replacement design. No fiddling or modifications needed, which is a relief.
The sensor’s build quality feels solid — it’s designed to withstand heat and vibrations. During testing, I appreciated how quick and easy the installation was, especially with the right tools.
Once in place, the connection felt secure, and I was able to restart the engine without issues.
One thing that stood out is its affordability. At just under $16, it’s an easy buy for anyone wanting to keep their engine running smoothly.
Plus, the 1-year manufacturer warranty gives some peace of mind against defects or early failures.
Overall, this sensor isn’t just a cheap part — it performs reliably under real-world conditions. It’s a perfect match for the D40 Navara’s exhaust and engine system, ensuring your vehicle stays in top shape.
What Features Should You Look for in an Exhaust for the D40 Navara?
The type of exhaust system you select will influence not only performance but also the installation complexity and sound profile of your vehicle. Cat-back systems, for example, replace the entire exhaust from the catalytic converter back, providing the most significant performance increase, while axle-back systems are typically easier to install and modify the sound without altering the performance as much.
Sound level is a personal preference that can greatly affect your driving experience; some drivers prefer a deep, throaty growl, while others might want to keep it more subdued to avoid drawing unwanted attention. It’s advisable to listen to sound clips or reviews to find the right match for your taste.
Fitment and installation ease are essential factors as well, as a direct bolt-on exhaust system saves time, effort, and potential costs associated with custom modifications. Ensuring compatibility with the D40 Navara is critical to avoid future headaches.
Performance gains should be considered to ensure that the exhaust system positively impacts horsepower and torque. Look for manufacturers that provide dyno tests or real-world performance metrics to back up their claims.
Lastly, brand reputation and customer reviews can guide you toward trustworthy products that have been tested by other D40 Navara owners. A good reputation often correlates with better customer service and product support as well.
What Types of Exhaust Systems Are Available for the D40 Navara?
The main types of exhaust systems available for the D40 Navara include:
- Cat-Back Exhaust System: This type of exhaust system replaces the exhaust components from the catalytic converter back to the rear of the vehicle.
- Turbo-Back Exhaust System: A turbo-back system includes all components from the turbocharger to the tailpipe, designed to improve turbo performance.
- Header or Extractor Exhaust System: This system replaces the factory exhaust manifold with performance headers to optimize exhaust flow from the engine.
- Performance Muffler: Upgrading to a performance muffler can enhance sound and improve exhaust flow without replacing the entire system.
- Stainless Steel Exhaust System: These systems are made from stainless steel, offering durability and resistance to corrosion, making them ideal for off-road conditions.
Cat-Back Exhaust System: The cat-back exhaust system is popular among D40 Navara owners because it enhances performance and sound without modifying the vehicle’s emissions system. It typically consists of a larger diameter piping and a high-performance muffler, resulting in improved exhaust flow and a deeper, more aggressive sound.
Turbo-Back Exhaust System: This system is ideal for those seeking maximum performance, as it allows for less back pressure and better turbo efficiency. By replacing the entire exhaust path from the turbocharger, it helps to unleash the full potential of the engine, making it a favorite for off-road enthusiasts and tuners alike.
Header or Extractor Exhaust System: By replacing the stock exhaust manifold with performance headers, this system can significantly improve the engine’s breathing capabilities. It reduces restrictions on exhaust flow and can lead to noticeable gains in horsepower and torque.
Performance Muffler: Installing a performance muffler is a simpler and often more cost-effective way to enhance the sound and flow of the exhaust without a full system replacement. These mufflers are designed to reduce back pressure while producing a more aggressive exhaust note, appealing to many drivers looking for a sportier sound.
Stainless Steel Exhaust System: Choosing a stainless steel exhaust system is a wise investment for those who frequently tackle harsh environments or off-road conditions. The corrosion resistance and durability of stainless steel ensure longevity, maintaining both performance and appearance over time, even in challenging conditions.
How Do Cat-Back Exhaust Systems Work for the D40 Navara?
Sound Enhancement: These systems often provide a deeper, more aggressive exhaust note compared to stock systems. The design of the muffler plays a crucial role in determining the sound characteristics, with performance-oriented mufflers producing a more pronounced roar under acceleration. This enhancement can significantly improve the driving experience for enthusiasts.
Materials: Most cat-back exhausts are made from stainless steel or aluminized steel, impacting durability and weight. Stainless steel offers superior resistance to rust and corrosion, ensuring longevity, while aluminized steel is often lighter and more affordable but may not last as long in harsh conditions. The choice of material can affect both performance and maintenance requirements.
Installation: Cat-back systems are generally designed for straightforward installation, often requiring minimal modifications. Many kits come with all necessary hardware and detailed instructions, making it accessible for DIY enthusiasts. However, professional installation is recommended for those unfamiliar with exhaust systems to ensure proper fitment and performance.
What Advantages Do Turbo-Back Exhaust Systems Offer?
Turbo-back exhaust systems offer several advantages for vehicles like the D40 Navara.
- Improved Performance: Turbo-back exhaust systems are designed to reduce back pressure, which allows the engine to expel exhaust gases more efficiently. This increased flow can lead to noticeable improvements in horsepower and torque, enhancing the overall performance of the vehicle.
- Enhanced Sound: These systems typically produce a deeper, more aggressive exhaust note compared to stock systems. This can enhance the driving experience for enthusiasts who appreciate a robust sound that reflects the vehicle’s performance capabilities.
- Better Fuel Efficiency: By optimizing exhaust flow, a turbo-back system can contribute to improved fuel efficiency. With less resistance in the exhaust system, the engine can operate more efficiently, which may result in better mileage during everyday driving.
- Increased Durability: Turbo-back exhaust systems are often made from high-quality materials such as stainless steel, which offers greater resistance to rust and corrosion. This durability can lead to a longer lifespan for the exhaust system compared to factory-installed components.
- Better Tuning Options: Upgrading to a turbo-back exhaust allows for more tuning options, enabling enthusiasts to modify their vehicle’s performance more easily. This compatibility with aftermarket tuning can lead to customized power gains tailored to individual driving styles and preferences.
What Performance Gains Can You Realistically Expect from Upgrading the Exhaust?
Upgrading the exhaust system on a D40 Navara can yield various performance gains.
- Increased Horsepower: An upgraded exhaust can enhance engine efficiency by improving airflow, which may lead to an increase in horsepower. This is particularly noticeable in turbocharged engines, where a less restrictive exhaust allows for better turbo spool and higher output.
- Improved Torque: A better exhaust system can optimize exhaust flow, resulting in improved torque, especially in the lower RPM range. This can enhance acceleration and overall drivability, making the vehicle feel more responsive during everyday driving conditions.
- Enhanced Fuel Efficiency: By reducing back pressure, a new exhaust can help the engine operate more efficiently, potentially leading to better fuel economy. When the engine can expel exhaust gases more effectively, it requires less fuel to maintain power, which can translate to savings at the pump.
- Better Sound Quality: Upgrading to a performance exhaust often results in a more aggressive and appealing exhaust note. This can enhance the driving experience, giving the vehicle a sportier character without excessive noise that could be bothersome.
- Reduced Weight: Many aftermarket exhaust systems are made from lighter materials, such as stainless steel or titanium, which can reduce the overall weight of the vehicle. A lighter exhaust contributes to improved performance and handling, especially in off-road conditions.
- Increased Engine Longevity: A high-quality exhaust system can help in maintaining optimal engine temperatures and lowering the risk of overheating. By improving exhaust flow, the engine operates more efficiently, which can contribute to its longevity and reliability over time.
What Key Considerations Should Influence Your Exhaust Selection for the D40 Navara?
When selecting the best exhaust for a D40 Navara, several key considerations should influence your decision.
- Material Quality: The material of the exhaust system can affect its durability and performance. Stainless steel is often preferred for its corrosion resistance and longevity, while mild steel can be less expensive but may not hold up as well to harsh conditions.
- Diameter of the Exhaust: The diameter of the exhaust pipes plays a significant role in exhaust flow and engine performance. A larger diameter can reduce back pressure and improve horsepower, but it may also affect low-end torque, so finding the right balance is essential.
- Exhaust Configuration: The configuration, including whether the exhaust is a cat-back or a turbo-back system, can influence performance. A cat-back system is easier to install and can provide noticeable sound and performance gains without altering emissions systems, while a turbo-back may offer more significant performance improvements but can be more complex to install.
- Sound Level: The sound produced by the exhaust system can greatly impact your driving experience. Some drivers prefer a louder, more aggressive tone, while others may want a quieter system that maintains a factory-like sound, so it’s essential to consider personal preferences and local noise regulations.
- Legal Compliance: Make sure that the exhaust system complies with local emissions and noise regulations. Choosing a system that is not street-legal can lead to fines or issues with vehicle inspections, so it’s critical to verify that the exhaust meets required standards.
- Brand Reputation: The reputation of the brand you choose can indicate the quality and reliability of the exhaust system. Established brands often provide warranties and customer support, which can be reassuring for buyers looking for long-term durability and performance.
- Installation Requirements: Consider whether the exhaust system can be installed at home or if professional installation is recommended. Some systems may require welding or special tools, which could increase the overall cost if you need to hire a mechanic.
How Important is the Material of the Exhaust System?
The material of the exhaust system is crucial as it affects durability, performance, and resistance to corrosion.
- Stainless Steel: Known for its excellent corrosion resistance and durability, stainless steel is a popular choice for exhaust systems. It can withstand high temperatures and is less prone to rust, making it ideal for vehicles exposed to harsh weather conditions or road salt.
- Mild Steel: While mild steel is more affordable, it lacks the corrosion resistance of stainless steel, making it susceptible to rust and degradation over time. This can lead to frequent replacements and repairs, particularly in areas with high humidity or road treatments.
- Aluminized Steel: This material is coated with aluminum to enhance its corrosion resistance compared to mild steel. It offers a balance between cost and durability, making it a viable option for mid-range exhaust systems, but it may still rust over an extended period if exposed to extreme conditions.
- Titanium: Titanium exhaust systems are lightweight and extremely strong, offering superior performance benefits. However, they come at a premium price and are often chosen for high-performance applications where weight savings and strength are critical.
- Carbon Fiber: An emerging choice in the exhaust market, carbon fiber is lightweight and has a unique aesthetic appeal. Though it provides excellent performance enhancement, its high cost and susceptibility to heat damage make it less practical for everyday use compared to traditional metals.
What Impact Does Sound Quality Have on Your Exhaust Choice?
Sound quality plays a significant role in selecting the best exhaust for a D40 Navara, influencing both performance and driving experience.
- Performance Enhancements: The right exhaust system can improve engine performance by optimizing airflow, which directly impacts sound quality. A well-designed exhaust allows for better exhaust gas expulsion, leading to increased horsepower and torque.
- Sound Characteristics: Different exhaust systems produce varying sound profiles, from deep and throaty to high-pitched and aggressive. Choosing an exhaust that matches your personal sound preference can enhance your driving pleasure and the overall character of your vehicle.
- Resonance and Drone: Certain exhaust systems might create unwanted resonance or drone at specific RPMs, which can be annoying during daily driving. A good exhaust choice minimizes these effects, ensuring a comfortable driving experience without compromising on sound quality.
- Material Quality: The materials used in the exhaust system affect its durability and sound output. Stainless steel, for example, not only offers longevity but also produces a quality sound that can enhance the vehicle’s overall appeal.
- Legal Considerations: Many regions have noise regulations that restrict the sound level of automotive exhausts. Choosing an exhaust that meets these legal standards while still delivering a satisfying sound is essential for maintaining compliance and avoiding fines.
What Are the Best Exhaust Options Currently Available for D40 Navara?
The best exhaust options for the D40 Navara can enhance performance, sound, and efficiency for truck enthusiasts.
- 2.5-inch Turbo Back Exhaust System: This system replaces the factory exhaust from the turbocharger, allowing for improved airflow and reduced back pressure. It often leads to increased power and torque, making it ideal for off-road and towing capabilities.
- 3-inch Cat-Back Exhaust System: A popular choice, this system enhances the exhaust flow without removing the catalytic converter, providing a balance of performance and legality. It typically offers a deeper sound and can improve horsepower, making it suitable for daily driving as well as off-road adventures.
- Stainless Steel Exhaust System: Known for durability and resistance to corrosion, stainless steel exhausts provide longevity and a sleek appearance. They can handle the rigors of outdoor environments while also maintaining optimal performance over time.
- Performance Muffler Upgrade: Upgrading to a performance muffler can significantly change the sound profile of the D40 Navara while also improving exhaust flow. This option allows for a customizable sound without the need for a full exhaust system replacement.
- Dump Pipe: A dump pipe is a critical component that connects the turbo to the exhaust system and improves turbo spool time. By reducing restrictions, a dump pipe can enhance overall engine performance, especially for those seeking maximum gains from their modifications.
What Installation Issues Might You Encounter When Upgrading the D40 Navara Exhaust?
When upgrading the exhaust system on a D40 Navara, several installation issues can arise:
- Fitment Compatibility: Ensuring the new exhaust system is compatible with the existing mounting points and dimensions of the D40 Navara is crucial.
- Clearance Problems: Upgraded exhausts may have different shapes or sizes, potentially causing clearance issues with the chassis or suspension components.
- Welding and Fabrication Needs: Some aftermarket exhausts may require additional welding or customization to fit properly, which can complicate the installation process.
- Oxygen Sensor Relocation: The position of oxygen sensors may need to be adjusted when changing the exhaust, affecting the vehicle’s performance if not done correctly.
- Heat Shield Modification: The stock heat shield may need modifications or removal to accommodate a new exhaust system, which can pose a risk of increased heat exposure to nearby components.
- Noise Levels: Upgrading to a performance exhaust may significantly increase noise levels, which could require additional sound-deadening measures for cabin comfort.
- Legal Compliance: It’s essential to ensure that any modifications meet local noise and emissions regulations, as non-compliance can lead to legal issues.
Fitment compatibility is vital as the new exhaust must align with the D40 Navara’s specific framework; otherwise, it may lead to improper installation or even damage. Clearance problems can occur when the new exhaust has a design that interferes with other vehicle parts, potentially leading to rattling or failure under load. Welding and fabrication needs may arise if the new exhaust does not match the factory mountings, requiring a skilled technician to make necessary adjustments.
Oxygen sensor relocation is another potential issue; it’s critical to ensure sensors are positioned correctly to maintain optimal engine performance and emissions control. Modification of the heat shield is necessary to prevent heat-related damage to other components, and failure to do so can lead to severe vehicle issues. Increased noise levels are a common result of performance exhaust upgrades, often necessitating additional measures to maintain a comfortable cabin environment.
Lastly, ensuring legal compliance with local regulations is essential, as failing to meet noise and emissions standards can result in fines or the need to revert to the original exhaust system.
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