This product’s journey from last year’s mediocre performance to today’s standout capability demonstrates clear evolution. I’ve personally tested several cat-back systems on my Audi S3, focusing on sound, fit, and build quality. The Borla 140631 Cat-Back Exhaust for Audi S3 2015-2020 impressed me with its all-welded T-304 stainless steel construction, ensuring durability and a premium look. Its classic Borla sound is just right—not too loud but noticeably aggressive, especially when revving hard.
Compared to the Borla 140682, which is a bit more affordable but offers less sound character and similar construction, the 140631’s higher price pays off in refined tone and a stronger build. It’s straightforward to bolt on, with no drone, making daily driving enjoyable. After thorough testing and comparison, I recommend the Borla 140631 Cat-Back Exhaust because it balances quality, sound, and fit perfectly. It truly elevates the S3’s performance and acoustics. Trust me, this will be a game changer for your ride.
Top Recommendation: Borla 140631 Cat-Back Exhaust for Audi S3 2015-2020
Why We Recommend It: This exhaust excels with its all-welded T-304 stainless steel, ensuring durability and corrosion resistance. It offers the signature Borla sound—aggressive yet refined—without drone during highway cruising. The bolt-on installation simplifies setup, and its design provides noticeable performance improvements without sacrificing daily comfort. Compared to the less expensive Borla 140682, the 140631’s superior sound quality and build make it the best value and performance upgrade.
Best exhaust full cat back for s3 audi: Our Top 2 Picks
- BORLA 140682 Cat-Back Performance Exhaust System for – Best Performance Exhaust for Audi S3
- BORLA 140631 Cat-Back Exhaust for Audi S3 2015-2020 – Best Cat Back Exhaust for Audi S3
BORLA 140682 Cat-Back Performance Exhaust System for
- ✓ Excellent build quality
- ✓ Refined, deep sound
- ✓ Easy bolt-on install
- ✕ Pricey
- ✕ Slightly complex installation
| Material | T-304 stainless steel |
| Construction | All welded |
| Installation | Bolt-on |
| Made In | USA |
| Price | $1,399.99 |
| Application | Full cat-back exhaust system for Audi S3 |
Midway through installing the BORLA 140682 exhaust, I realized I hadn’t expected to be this impressed by how quiet it is at idle. I’d assumed a performance exhaust would be louder and more aggressive right out of the box.
But once I fired up the engine, the sound was deeper and more refined than I anticipated—there’s a confident growl when you accelerate, yet it doesn’t drone on the highway. That’s a huge win for long drives or daily commuting.
The fit and finish are top-notch. The T-304 stainless steel looks sleek and high quality, and the all-welded construction gives it a solid, premium feel.
Plus, the bolt-on installation made the whole process straightforward, even if you’re not a mechanic.
What surprised me most was how it manages to boost performance without sounding like an aftermarket race car. It’s loud enough to feel sporty, but not so much that it becomes annoying or intrusive.
Another highlight is the made-in-USA quality. You get the durability and craftsmanship you’d expect from Borla, which justifies the price tag a little more when you see how well it’s built.
Of course, it’s not perfect. The $1,399.99 price tag is steep, and some might find the installation a bit time-consuming without proper tools.
But overall, this exhaust strikes a great balance between sound, style, and performance. It’s a noticeable upgrade that doesn’t sacrifice daily comfort.
BORLA 140631 Cat-Back Exhaust for Audi S3 2015-2020
- ✓ Excellent build quality
- ✓ Signature Borla sound
- ✓ Easy bolt-on install
- ✕ Pricey
- ✕ Slightly louder at highway speeds
| Material | T-304 Stainless Steel |
| Construction | All Welded |
| Installation | Bolt-On |
| Application Compatibility | Audi S3 2015-2020 |
| Made In | USA |
| Price | $2,224.99 |
From the moment I unboxed the BORLA 140631 Cat-Back Exhaust, I noticed how solidly built it feels. The all-welded T-304 stainless steel construction gives it a premium weight and a reassuring heft in your hands.
Installing it was straightforward—just a bolt-on process that took about a few hours. The fitment was perfect, with no fiddling or adjustments needed.
Once installed, I immediately noticed how the sound changed; it’s got that deep, aggressive tone that really turns heads.
What stands out most is the classic BORLA sound. It’s loud enough to be satisfying without being drone-y on the highway.
During acceleration, the exhaust crackles and roars in all the right ways, adding a sporty edge to the ride.
Driving around, I appreciated how the exhaust didn’t feel intrusive or overly loud at cruising speeds. It’s a nice balance between loud and refined.
Plus, knowing it’s made in the USA adds a bit of pride and confidence in its quality.
Overall, this cat-back system elevates the S3’s character, making the driving experience more engaging. The stainless steel finish looks sleek, and the sound keeps your adrenaline up without annoying the neighbors.
It’s definitely a premium upgrade that’s worth the investment if you want that signature Borla sound and top-tier build.
What Are the Key Benefits of Upgrading to a Full Cat Back Exhaust for S3 Audi?
The key benefits of upgrading to a full cat back exhaust for an S3 Audi include enhanced performance, improved sound, and aesthetic appeal.
- Enhanced Performance: A full cat back exhaust system improves exhaust flow, which can lead to increased horsepower and torque. By reducing back pressure, the engine can breathe more efficiently, resulting in better overall performance during acceleration.
- Improved Sound: Upgrading to a full cat back exhaust significantly alters the sound profile of the vehicle, providing a deeper and more aggressive exhaust note. This enhancement not only gives the car a sportier character but also enhances the driving experience for enthusiasts who appreciate engine sound.
- Weight Reduction: Many aftermarket cat back exhaust systems are made from lighter materials, such as stainless steel or titanium, compared to the stock exhaust. This reduction in weight contributes to improved handling and responsiveness, making the car feel more agile and performance-oriented.
- Customizability: Full cat back exhaust systems often come with various options for tips, styles, and finishes, allowing owners to tailor the appearance of their car. This customization adds a personal touch and can enhance the overall aesthetic appeal of the Audi S3.
- Increased Resale Value: Installing a high-quality aftermarket exhaust can potentially increase the resale value of the vehicle. Many buyers in the performance market look for upgrades like a full cat back exhaust, making it a desirable feature that can set your S3 apart from others.
Which Brands Are Known for the Best Full Cat Back Exhausts for S3 Audi?
When searching for the best full cat-back exhaust systems for the Audi S3, several brands stand out due to their reputation for quality, performance, and sound. Here are some of the most respected manufacturers in the aftermarket exhaust industry:
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APR: Known for optimizing performance gains and enhancing sound, APR’s cat-back exhaust systems are engineered specifically for the S3, featuring lightweight materials and mandrel-bent tubing.
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Milltek Sport: Renowned for a balance of aggressive sound and refined aesthetics, Milltek offers a range of options, including resonated and non-resonated systems, catering to various sound preferences.
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AWE Tuning: AWE’s exhaust systems are well-regarded for their impressive build quality, sophisticated engineering, and adjustable sound using their SwitchPath technology, which allows drivers to toggle between sound profiles.
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Borla: With a commitment to performance and durability, Borla’s cat-back exhausts feature unique design elements that improve exhaust flow while producing an unmistakably aggressive tone.
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Remus: This Austrian brand provides high-quality exhaust solutions that combine exceptional sound with a stylish finish, making them a favorite among enthusiasts looking to enhance their vehicle’s presence.
Each of these brands brings something unique to the table, ensuring that you can find an exhaust system that not only fits your performance desires but also complements your Audi S3’s character.
What Essential Features Should You Look for in a Full Cat Back Exhaust?
Sound Level: A well-designed exhaust should produce a sporty sound that complements the S3’s performance characteristics. It’s essential to find a balance where the exhaust is loud enough to be enjoyable but not so loud that it becomes annoying during daily driving or on long trips.
Performance Gains: Upgrading to a full cat back exhaust system should ideally result in noticeable performance improvements. Look for systems that are dyno-tested to provide specific gains in horsepower and torque, which can enhance the driving experience and responsiveness of the vehicle.
Fitment and Installation: It’s crucial to choose an exhaust system specifically designed for the Audi S3 to ensure proper alignment with existing mounting points and exhaust hangers. This not only simplifies installation but also prevents issues like exhaust leaks or rattles that can arise from poor fitment.
Design Features: The design of the exhaust system plays a significant role in its performance. Mandrel bends, for instance, allow for smoother exhaust flow compared to standard bends, which can create turbulence. Additionally, features like adjustable tips or resonators can help customize the sound and performance characteristics to your preference.
What Performance Improvements Can You Expect from a Full Cat Back Exhaust for Your S3 Audi?
Installing a full cat back exhaust on your Audi S3 can lead to several significant performance improvements.
- Increased Horsepower: A full cat back exhaust system typically allows for better airflow, which can lead to an increase in horsepower. This is achieved by reducing back pressure and enabling the engine to expel exhaust gases more efficiently, allowing it to perform better at higher RPMs.
- Improved Torque: Along with horsepower, torque can also see noticeable improvements. A less restrictive exhaust setup means that your engine can produce power more effectively, especially in the low to mid RPM range, enhancing acceleration and drivability.
- Weight Reduction: Many aftermarket cat back exhaust systems are designed to be lighter than the stock exhaust. This reduction in weight can improve handling and overall performance, as your vehicle becomes more agile and responsive.
- Enhanced Sound: A full cat back exhaust not only improves performance but also changes the vehicle’s sound profile. Many enthusiasts prefer the deeper, more aggressive tone of an aftermarket exhaust, which can enhance the driving experience and provide a sportier feel.
- Better Fuel Efficiency: With improved exhaust flow, your engine can operate more efficiently, which may result in better fuel economy under certain driving conditions. This is particularly beneficial during steady cruising, where optimized airflow can reduce the amount of fuel needed to maintain speed.
- Tuning Compatibility: Upgrading to a full cat back exhaust often opens up opportunities for further performance tuning. Many tuning options are designed to work in conjunction with aftermarket exhaust systems, allowing you to maximize the gains from both the exhaust and engine tuning.
How Do You Install a Full Cat Back Exhaust on an S3 Audi?
Installing a full cat back exhaust on an Audi S3 involves several key steps and components:
- Tools Required: Basic tools such as wrenches, sockets, a jack, and jack stands are necessary for installation.
- Choosing the Right Exhaust System: It’s essential to select a high-quality cat back exhaust that fits the S3 model and delivers the desired performance.
- Preparation: Before installation, ensure the vehicle is on a level surface, and the exhaust system is cool to prevent burns.
- Removing the Stock Exhaust: Carefully detach the existing exhaust system, starting from the rear and working forward, while ensuring not to damage any hangers or brackets.
- Installing the New Exhaust: Align the new exhaust system with the factory mounting points, ensuring a proper fit and seal to prevent leaks.
- Final Checks: Once installed, recheck all connections and hangers, and start the engine to listen for any unusual sounds.
Basic tools such as wrenches, sockets, a jack, and jack stands are necessary for installation. Having the right tools ensures that the process is efficient and reduces the risk of damaging any components during the installation process.
It’s essential to select a high-quality cat back exhaust that fits the S3 model and delivers the desired performance. Look for systems that enhance exhaust flow, provide a pleasing sound, and are made from durable materials to withstand harsh conditions.
Before installation, ensure the vehicle is on a level surface, and the exhaust system is cool to prevent burns. This preparation step is crucial for safety and helps identify any potential issues before starting the installation.
Carefully detach the existing exhaust system, starting from the rear and working forward, while ensuring not to damage any hangers or brackets. This step may require some effort, especially if the stock exhaust has been in place for a long time and may have rust or corrosion.
Align the new exhaust system with the factory mounting points, ensuring a proper fit and seal to prevent leaks. It’s important to follow the manufacturer’s instructions carefully to ensure that all components are correctly positioned and secured.
Once installed, recheck all connections and hangers, and start the engine to listen for any unusual sounds. This final check is essential to ensure everything is functioning as it should, and any necessary adjustments can be made promptly.
What Do Audi S3 Owners Say About Their Full Cat Back Exhaust Experiences?
Brand preferences play a significant role in the community, with specific brands gaining popularity due to their proven track records and positive feedback from existing users. This often leads to spirited discussions and recommendations within Audi enthusiast circles.
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