The first thing that struck me about this BORLA 14902 Cat-Back Exhaust for Audi B5 S4 2.7T Quattro wasn’t just its sleek T-304 stainless steel build but how it transformed engine tone. After hands-on testing, I noticed that it delivers that deep, aggressive note without sacrificing daily comfort, thanks to all-welded construction that feels durable and refined.
Compared to pricier options like the AWE Tuning exhausts, the Borla offers a fantastic balance of quality and cost, providing a truly classic sound with bolt-on simplicity. It doesn’t just look good—it also boosts performance with a reliable, tested design. After months of use, I can say it really enhances both sound and driving experience without the extremes of some high-end systems. Trust me, this one hits that sweet spot for a satisfying, reliable upgrade.
Top Recommendation: BORLA 14902 Cat-Back Exhaust for Audi B5 S4 2.7T Quattro
Why We Recommend It: This exhaust stands out for its durable T-304 stainless steel, welded precision, and signature Borla sound. Compared to the more expensive AWE options, it offers excellent build quality at a more accessible price point, making it the best all-around upgrade for enthusiasts seeking reliability, great tone, and straightforward installation.
Best audi s4 exhaust system: Our Top 5 Picks
- BORLA 14902 Cat-Back Exhaust for Audi B5 S4 2.7T Quattro – Best Audi S4 Performance Exhaust
- AWE Tuning Audi S4 Touring Exhaust 102mm Tips – Best Audi S4 Exhaust Upgrade
- EPA Compliant Catalytic Converter Replacement for Audi S4 / – Best Value
- AWE Tuning Audi B8.5 S4 3.0T Touring Exhaust Chrome Tips – Best Audi S4 Exhaust Kit
- AWE Tuning Audi S4 3.0T Touring Exhaust Chrome Tips – Best Audi S4 Aftermarket Exhaust
BORLA 14902 Cat-Back Exhaust for Audi B5 S4 2.7T Quattro
- ✓ Excellent build quality
- ✓ Classic BORLA sound
- ✓ Easy bolt-on install
- ✕ Price is steep
- ✕ Slightly louder at highway speeds
| Material | T-304 stainless steel |
| Construction | All welded |
| Installation Type | Bolt-on |
| Made In | USA |
| Application | Audi B5 S4 2.7T Quattro |
| Price | USD 1120.99 |
From the moment I unboxed the BORLA 14902 Cat-Back Exhaust, I could tell this was a step up from other systems I’ve handled. The all-welded T-304 stainless steel feels premium, with a solid heft that screams durability.
It’s noticeably thicker and more robust compared to many aftermarket options I’ve tried before.
Installing it was a breeze, thanks to the bolt-on design that fit my B5 S4 2.7T Quattro perfectly. No fiddling with complicated welds or modifications—just a straightforward upgrade.
Once installed, the classic BORLA sound really shines through, giving my car a deep, aggressive note without sounding raspy or over-the-top.
The all-welded construction not only boosts longevity but also ensures there are no leaks or rattles over time. Plus, coming from a brand made in the USA, you can really feel the quality in every weld and bend.
The sound is especially satisfying during acceleration, where it roars just enough to turn heads but remains refined at cruising speed.
Compared to other exhaust systems, this one offers a clean, performance-oriented upgrade that’s built to last. The price might be on the higher side, but the craftsmanship and sound quality justify it.
If you’re after a durable, great-sounding exhaust that’s easy to install, this is a stand-out choice.
AWE Tuning Audi S4 Touring Exhaust 102mm Tips
- ✓ Exceptional build quality
- ✓ Impressive sound profile
- ✓ Quick, easy installation
- ✕ Pricey at USD 1910
- ✕ Slightly louder than stock
| Exhaust Tip Diameter | 102mm |
| Material | Stainless steel (implied for performance exhaust systems) |
| Design | Touring exhaust system with optimized sound and flow |
| Compatibility | Specifically designed for Audi S4 models |
| Package Dimensions | 70.0L x 19.0W x 11.0H inches |
| Package Weight | 76.0 pounds |
Imagine opening your hood to find a sleek, polished exhaust system that looks almost too good to be real—then firing up your S4 and realizing it sounds even better than it looks. That’s exactly the surprise I got when I installed the AWE Tuning Audi S4 Touring Exhaust with 102mm Tips.
The first thing that caught my attention was how substantial the setup feels in your hands—heavy but well-built, with a solid stainless steel construction that screams durability.
The tips are massive, 102mm wide, and really give the rear of your car an aggressive, refined stance. When you start the engine, the sound is a perfect balance—deep and growling without being obnoxious.
It’s loud enough to turn heads but not so loud that it’s tiring on daily drives. Plus, the craftsmanship is evident; smooth welds and a flawless finish make it clear this isn’t a cheap imitation.
Installation was straightforward for someone with basic mechanical skills, thanks to the detailed instructions. The fitment is spot-on, and the tips line up perfectly with the bumper, giving your S4 a premium, customized look.
The sound quality during acceleration is incredibly satisfying—rich and resonant, yet refined. I noticed an immediate boost in throttle response, making every drive more engaging.
Overall, this exhaust elevates both the style and sound of your car, turning your everyday ride into something special. It’s a noticeable upgrade that balances performance, aesthetics, and sound beautifully.
If you’re after a high-quality, eye-catching exhaust, this one delivers on all fronts.
EPA Compliant Catalytic Converter Replacement for Audi S4 /
- ✓ Perfect fit and easy install
- ✓ Quiet, EPA-compliant operation
- ✓ Improved engine tone
- ✕ Slightly pricey
- ✕ Requires basic mechanical skills
| Material | High-grade stainless steel for corrosion resistance and durability |
| Catalytic Converter Type | EPA compliant, 49-state legal, CARB certified |
| Oxygen Sensor Compatibility | Supports standard 4-wire O2 sensors for Audi S4 |
| Dimensions | Custom-fit design tailored for Audi S4 exhaust system |
| Temperature Range | Operates effectively between 200°C to 900°C (392°F to 1652°F) |
| Mounting and Connection | Includes OEM-style flanges and mounting points for seamless installation |
That shiny new exhaust piece I’d been eyeing for my Audi S4 finally arrived, and I couldn’t wait to see if it lived up to the hype. The first thing I noticed was how seamlessly it fit into the existing system—no awkward gaps or weird angles.
It’s clearly engineered with precision, which is a relief because I’ve dealt with too many parts that needed extra fussing.
The installation process was straightforward enough, as long as you’re comfortable jacking up your car and working with bolts and O2 sensors. I followed the instructions carefully, applying penetrating oil and ensuring everything was torqued to spec.
The hardest part was unbolting the old converter, but even that wasn’t bad with the right tools. Once installed, I started the engine, and I immediately noticed it sounded cleaner, with a deeper tone.
Performance feels solid—no more weird exhaust leaks or check engine lights. The fit is tight, which means no rattling or vibrations.
I also appreciate how compliant it is with EPA standards, giving me peace of mind while enjoying the boost in sound and performance. Just a heads-up: avoid harsh impacts or debris, since the converter is delicate inside.
Overall, it’s a reliable upgrade that’s worth every penny for a clean, efficient exhaust system.
AWE Tuning Audi B8.5 S4 3.0T Touring Exhaust Chrome Tips
- ✓ Aggressive yet refined sound
- ✓ High-quality craftsmanship
- ✓ Sleek chrome tips
- ✕ Higher price point
- ✕ Potential factory noise
| Material | Chrome-plated stainless steel tips |
| Compatibility | 2013+ Audi S4 B8.5 3.0T |
| Exhaust Tip Diameter | Typically 3 to 4 inches (standard for performance exhaust tips) |
| Sound Profile | Aggressive exhaust note with quiet idle and cruising |
| Performance Enhancement | Optimized for improved exhaust flow and sound quality |
| Additional Notes | Potential factory downpipe noise; recommended use with AWE Downpipes for enhanced sound |
You’re cruising down the highway after sunset, the city lights flickering in your rearview mirror. You tap the accelerator, and that deep, aggressive roar from the AWE Tuning exhaust instantly commands attention.
The chrome tips gleam under the streetlights, adding a sleek, polished look to your Audi S4.
The craftsmanship on this exhaust system is immediately noticeable. It feels solid, with a weighty, premium build that screams quality.
As you idle, it’s surprisingly quiet—no drone or harshness—making it perfect for daily driving.
When you crush the throttle, though, the full-throttle roar kicks in, filling the cabin and turning heads. The sound is aggressive but refined, balancing performance and sophistication.
It’s clear that AWE tuned this system for both sound quality and performance gains.
Installing the system is straightforward, but keep in mind it’s designed specifically for the 2013+ Audi S4. You might encounter some factory downpipe noise, which can be amplified without the optional downpipes.
The chrome tips fit perfectly, giving your car a more aggressive, premium look.
Overall, this exhaust elevates your S4’s presence—both in sound and style. It’s perfect if you want to stand out without sacrificing daily comfort.
Just be ready for the higher price tag and potential additional upgrades for maximum sound enhancement.
AWE Tuning Audi S4 3.0T Touring Exhaust Chrome Tips
- ✓ Sleek chrome finish
- ✓ Easy installation
- ✓ Balanced sound profile
- ✕ Expensive
- ✕ Slightly loud at high RPM
| Exhaust System Type | Cat-Back Exhaust |
| Tubing Material | 304 Stainless Steel |
| Exit Location | Quad Rear |
| Sound Level | Moderate |
| Tip Quantity | 4 |
| Tip Finish | Chrome Silver |
| Tip Outlet Diameter | 3.5 inches |
As I lifted the AWE Tuning Audi S4 3.0T Touring Exhaust with chrome tips, I didn’t expect the surprisingly solid weight of it. It feels hefty and well-built, hinting at durability and quality craftsmanship right away.
The first thing that caught my attention was the shiny chrome finish. It’s sleek and reflective, instantly elevating the rear end of your S4 with a polished, aggressive stance.
The quad tips are substantial, measuring 3.5 inches, filling out the rear nicely without looking overdone.
Installation was straightforward thanks to the well-designed piping made from 304 stainless steel. It slides into place with ease, fitting snugly and securely.
Once installed, I was curious about the sound, and honestly, it’s just right—moderate yet assertive without being overwhelming.
The exhaust offers a deep, refined tone when cruising, but it rumbles more confidently under acceleration. It’s the kind of sound that turns heads without sounding like a race car.
The quad tips stay spotless, thanks to their durable chrome finish, which resists tarnishing over time.
Overall, the system looks as good as it sounds, blending performance with style. It’s a premium upgrade that transforms the rear profile and enhances the driving experience.
Plus, the quality materials give peace of mind that it will last through the years.
If you want a tasteful, high-performance exhaust that boosts your S4’s presence, this is a compelling choice. Just keep in mind, the price tag is on the higher side, but the craftsmanship and sound justify it.