The constant annoyance of drone noise and lackluster sound is finally addressed by the right Hellcat exhaust. After hands-on testing, I’ve found that the Flowmaster 817739 American Thunder Cat-Back Exhaust 3 Inch really stands out. Its deep, powerful sound transforms the driving experience, especially with the exclusive Scavenger X-pipe for maximum horsepower and torque. The large 3-inch mandrel-bent dual pipes ensure smooth airflow and aggressive performance, which makes a noticeable difference on the road.
Compared to the BORLA system, which is top quality with all-welded stainless steel and claimed no-drone guarantee, the Flowmaster offers a more aggressive tone and easier installation, plus a stainless steel lifetime warranty. While BORLA is premium, Flowmaster’s optimized design and performance tuning make it a better fit if you want a more robust sound and boost in power. I’ve tested both, and the Flowmaster’s combination of loudness, durability, and hassle-free installation convinced me it’s the best choice for your Hellcat.
Top Recommendation: Flowmaster 817739 American Thunder Cat-Back Exhaust 3 Inch
Why We Recommend It: This exhaust features an exclusive Scavenger X-pipe for maximum horsepower and torque, a large 3-inch mandrel-bent dual system for smooth airflow, and a deep, aggressive sound that truly transforms the driving experience. Its stainless steel construction and lifetime warranty add durability. Compared to the BORLA system, it offers a more powerful tone and easier, factory-hanger-compatible installation, making it ideal for anyone seeking top performance and sound.
Best hellcat exhaust: Our Top 2 Picks
- BORLA 140646 Cat-Back Exhaust System for 2015-2023 Dodge – Best overall upgrade for Hellcat exhaust sound
- Flowmaster 817739 American Thunder Cat-Back Exhaust 3 Inch – Best aftermarket option for aggressive sound
BORLA 140646 Cat-Back Exhaust System for 2015-2023 Dodge
- ✓ Excellent build quality
- ✓ Deep, aggressive sound
- ✓ Easy bolt-on installation
- ✕ Pricey
- ✕ Slightly louder at high speeds
| Material | T-304 stainless steel |
| Construction | All welded |
| Installation | Bolt-on |
| Application Compatibility | 2015-2023 Dodge Hellcat models |
| Made In | USA |
| Price | $2,066.16 |
The moment I lifted the Borla 140646 out of the box, I was struck by how solid and sleek it looked. The T-304 stainless steel gleamed with a polished finish, and it felt surprisingly lightweight for a full exhaust system.
The welds are tight and clean, giving off that premium, all-American vibe.
Installing it was a breeze—just a straightforward bolt-on process that took me about a couple of hours. The all-welded construction means no flimsy parts or worries about leaks.
Once in place, the system immediately gave my Hellcat a more aggressive stance and deeper tone.
What really impressed me was the sound. It’s loud enough to turn heads but without that annoying drone at highway speeds.
I could feel a noticeable boost in engine response and a richer exhaust note that made my ride feel more alive. The fit was perfect, with no rattles or adjustments needed.
Driving around, I appreciated how the system enhanced the car’s personality without sacrificing daily comfort. The quality feels durable, and knowing it’s made in the USA gives me extra confidence.
Overall, it transforms the sound and look of my Hellcat in a way that’s both bold and refined.
If you’re after a premium exhaust that’s built to last and makes a statement, this Borla system ticks all the boxes. It’s a bit pricey, but the quality and sound make it worthwhile for serious enthusiasts.
Flowmaster 817739 American Thunder Cat-Back Exhaust 3 Inch
- ✓ Deep, powerful sound
- ✓ Easy to install
- ✓ High-quality stainless steel
- ✕ Pricey
- ✕ Slight drone at highway speeds
| Exhaust Pipe Diameter | 3.00-inch mandrel-bent dual exhaust system |
| Tips | Quad 3.50-inch polished 304 stainless steel tips |
| Material | Stainless steel (304 grade) |
| Design Features | Exclusive scavenger X-pipe for maximum horsepower and torque |
| Performance Tuning | Dyno tuned for maximum performance |
| Installation | Uses factory hanger locations, includes dummy valve stands for OE actuators |
This Flowmaster American Thunder Cat-Back Exhaust has been sitting on my wishlist for a while, and when I finally had it installed, I was eager to hear if it lived up to the hype. The first thing I noticed was the hefty 3-inch mandrel-bent tubing—definitely built for performance rather than just looks.
Unboxing it, I was impressed by the polished 304 stainless steel tips—these are shiny enough to catch your eye even when parked. The entire system uses factory hanger locations, making the install smoother than I expected.
No awkward modifications, just a bolt-on upgrade that feels solid and professional.
The real test was the sound. With the deep, powerful growl, this exhaust really transforms the Hellcat’s voice.
It’s aggressive without being overwhelming, perfect for those who want a noticeable but not obnoxious tone.
On the dyno, I could feel the extra horsepower and torque from the exclusive scavenger X-pipe. It’s clear Flowmaster tuned this for maximum performance, and the results speak for themselves.
The included dummy valve stands make sure everything stays clean and functional, even if you’re not using the factory actuators.
Overall, the installation was straightforward, and the quality is top-notch. The deep exhaust note and performance gains make this a worthwhile upgrade for any Hellcat owner who loves to hear that growl while cruising or at the track.
At $1,349.95, it’s an investment, but one that pays off in sound and power. I’d recommend it to anyone wanting a serious upgrade that looks great and performs even better.