If you’re an Audi enthusiast, you already know the RS6 C8 isn’t just a luxury wagon—it’s a supercar in disguise. With its 4.0L twin-turbo V8, it delivers breathtaking acceleration, razor-sharp handling, and everyday practicality. But for many performance-minded drivers, stock is just the starting point. One of the most effective upgrades to unleash even more power and sound is swapping the factory downpipes for performance options.

Today, we’re diving deep into the world of audi rs6 c8 downpipes catless and catted—what they are, how they work, and which might be right for you.

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What Are Downpipes, and Why Do They Matter?

Downpipes are a key part of your Audi RS6 C8’s exhaust system. They connect the turbochargers to the rest of the exhaust, channeling hot gases away from the engine. The factory downpipes are equipped with catalytic converters (or “cats”) that clean up emissions, but these also add restriction.

Performance downpipes—either catless or catted—reduce that restriction, improving exhaust flow. This can lead to:

• More horsepower and torque
• Faster turbo spool
• A throatier, more aggressive exhaust note
• Lower exhaust gas temperatures

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Catless Downpipes: Maximum Flow, Maximum Sound

Catless downpipes are exactly what they sound like—downpipes without catalytic converters. For the RS6 C8, this means:

• Performance Gains: With zero restriction from cats, you’ll get the best possible exhaust flow. This often means noticeable horsepower increases, especially when paired with a proper ECU tune.
• Sound Upgrade: Expect a much louder, rawer, and sportier tone. Turbo spool and crackles become more pronounced.
• Track-Focused: Catless downpipes are popular in racing environments where emissions compliance isn’t an issue.

But here’s the trade-off: Without catalytic converters, emissions will be higher. In many regions, this makes catless systems illegal for street use. You may also notice stronger exhaust fumes, and some cars will throw a “check engine” light unless tuned to account for the missing cats.

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Catted Downpipes: The Balanced Option

Catted downpipes include high-flow catalytic converters. They’re designed to keep most of the emissions-reducing benefits while allowing far better exhaust flow than OEM parts. For the Audi RS6 C8, this means:

• Performance Boost: Not quite as free-flowing as catless, but still a big step up from stock. You can see significant horsepower gains with an ECU tune.
• Refined Sound: Louder than stock, but without the extreme volume of catless systems. The tone is deep and sporty without being overwhelming.
• Street-Legal in More Places: Many high-flow cats meet emissions requirements in certain regions, though laws vary, so always check your local regulations.

For daily drivers who want extra performance without pushing legality boundaries, catted downpipes are often the best compromise.

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Installation & Tuning Considerations

Upgrading to audi rs6 c8 downpipes catless and catted isn’t as simple as bolting them on. Here’s what you need to know:

1. Professional Installation: Downpipe replacement involves working with the exhaust, turbos, and tight engine bay spaces. A pro mechanic ensures proper fitment and prevents exhaust leaks.
2. ECU Tuning: To maximize gains and avoid error codes, a performance tune is highly recommended. Catless setups especially require a tune to prevent “check engine” lights.
3. Supporting Mods: Pairing downpipes with an upgraded exhaust system, air intake, and intercooler can push your RS6’s performance even further.

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Which Should You Choose—Catless or Catted?

It comes down to your priorities:

• Go Catless if you want the absolute most performance and sound, don’t mind the extra noise and smell, and will mostly use the car in non-emissions-restricted environments.
• Go Catted if you want a significant upgrade in performance and sound while keeping things more refined and emissions-friendly for street use.

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Final Thoughts

The audi rs6 c8 downpipes catless and catted upgrade is one of the best ways to unlock the true potential of Audi’s super-wagon. Whether you crave the wild, unfiltered roar of a catless setup or the balanced refinement of high-flow catted pipes, the result is a more thrilling, responsive, and emotionally engaging drive.

Just remember—performance tuning is as much about responsibility as it is about speed. Choose the setup that fits your driving style, local regulations, and long-term goals. Then, buckle up, hit the road, and enjoy every growl, crackle, and surge of power your upgraded RS6 has to offer.