Unleashing Power: The Ultimate Guide to Audi RS6 C8 Downpipes (Catless and Catted)
The Audi RS6 C8 is already a beast — a twin-turbocharged 4.0L V8 masterpiece that blends luxury and raw aggression. But for those chasing true performance refinement, the stock exhaust setup can feel like it’s holding back the monster within. That’s where upgraded audi rs6 c8 downpipes catless and catted come in, transforming sound, throttle response, and power delivery in ways that leave the stock system miles behind.
What Are Downpipes and Why Upgrade Them?
Downpipes are the crucial link between your turbochargers and the rest of your exhaust system. In stock form, they come equipped with restrictive catalytic converters designed to meet emissions standards — but these restrictions can stifle airflow and reduce power. Upgrading to aftermarket downpipes opens up the system, allowing turbochargers to spool faster, exhaust gases to escape more freely, and horsepower to climb significantly.
In the RS6 C8, the difference is night and day. The upgraded downpipes improve turbo efficiency, reduce back pressure, and create that exhilarating growl every Audi enthusiast dreams about.
The Two Titans: Catless vs. Catted Downpipes
When it comes to choosing your upgrade, you’ll encounter two main options: catless and catted downpipes. Both bring distinct advantages — it all depends on your goals, driving style, and local regulations.
1. Catless Downpipes – For the Pure Adrenaline Junkie
Catless downpipes remove the catalytic converters entirely. This means zero restrictions, leading to maximum airflow and performance. The gains can be impressive — often up to 25–40 horsepower depending on tune and supporting mods. You’ll notice:
- Sharper turbo spool and response
- Aggressive, race-inspired exhaust notes
- Significant torque increase in mid and high RPM ranges
However, the trade-offs are worth noting. Catless systems are typically not road-legal in most regions, as they eliminate emissions control. They can also be louder and produce a stronger exhaust odor. For those using the RS6 C8 primarily for track or off-road applications, though, catless downpipes are the ultimate choice for performance and drama.
2. Catted Downpipes – The Balanced Performer
Catted downpipes, on the other hand, retain high-flow catalytic converters designed for better emissions control without strangling performance. These high-flow cats maintain much of the power gain — typically within 10% of catless setups — while keeping your RS6 compliant with most emission standards.
The benefits of catted systems include:
- Reduced exhaust smell
- Controlled noise levels for daily driving
- Legal compliance in more jurisdictions
- Smooth, refined tone with added performance
If you want the best of both worlds — enhanced performance and peace of mind — catted downpipes are your ideal match.
Performance and Sound Transformation
Once installed, the transformation is immediate. The deep rumble at idle turns heads, while acceleration produces a symphony of controlled aggression. The engine breathes more freely, and the throttle feels crisp, eager, and alive. Pairing these downpipes with a stage 1 or stage 2 tune can push your Audi RS6 C8 into supercar territory, with gains exceeding 700 horsepower on pump fuel.
Build Quality and Installation
Quality matters. Premium aftermarket brands use aerospace-grade stainless steel or Inconel to ensure durability and heat resistance. Precision engineering guarantees perfect fitment, avoiding rattles or exhaust leaks. Installation typically requires professional expertise due to the complexity of the RS6’s twin-turbo setup, but the results are well worth it.
