The Audi RS6 C8 is one of the most powerful and refined performance wagons ever made. Its twin-turbocharged V8 engine delivers a perfect balance of raw power, luxury, and everyday practicality. However, for those who crave even more power and a deeper exhaust note, upgrading to Audi RS6 C8 downpipes catless and catted is one of the most impactful modifications available.

Whether you want maximum performance or a balance between power and emissions compliance, understanding the difference between catless and catted downpipes is crucial before making your choice.

What Are Downpipes and Why Are They Important?

A downpipe is a section of the exhaust system that connects the turbocharger outlet to the mid-pipe or exhaust system. mercedes e63 downpipe install Its primary function is to direct exhaust gases away from the turbocharger efficiently. The stock downpipes on most vehicles, including the Audi RS6 C8, include restrictive catalytic converters that help reduce emissions but limit airflow.

Aftermarket downpipes replace these restrictive components with freer-flowing pipes, allowing exhaust gases to exit more easily. This results in better turbo response, increased horsepower, and an enhanced exhaust sound. For turbocharged engines like the RS6 C8, the downpipe upgrade is one of the most effective performance enhancements you can make.

Catless vs. Catted Downpipes – What’s the Difference?

When shopping for Audi RS6 C8 downpipes catless and catted, you’ll come across two main options:

1. Catless Downpipes – These do not include catalytic converters, offering the least resistance to exhaust flow. As a result, they deliver maximum power gains, faster turbo spool, and a louder, more aggressive exhaust note. However, they may not be emissions-compliant in certain regions and can trigger check-engine lights without proper tuning.
2. Catted Downpipes – These include high-flow catalytic converters that still improve performance compared to stock but help reduce emissions and prevent unpleasant exhaust odors. Catted downpipes offer a balanced option between performance, legality, and comfort for street-driven RS6 C8s.

Benefits of Upgrading to Performance Downpipes

1. Increased Horsepower and Torque – Reducing exhaust restriction helps the turbochargers spool more quickly, delivering more power throughout the RPM range. Gains of 25–40 horsepower are common, depending on tuning and supporting mods.
2. Enhanced Exhaust Sound – One of the most exciting results of a downpipe upgrade is the sound transformation. The Audi RS6 C8’s V8 engine produces a deeper, more aggressive exhaust note that truly brings out the character of this performance machine.
3. Improved Turbo Efficiency – With less backpressure, the turbos can operate more efficiently. This reduces turbo lag and makes throttle response sharper and more immediate.
4. Better Fuel Efficiency – While performance is the main goal, the improved exhaust flow can also lead to slightly better fuel economy under certain driving conditions.
5. Perfect for Future Modifications – Downpipes provide the ideal foundation for tuning or other performance upgrades, helping maximize the benefits of ECU remaps and exhaust system modifications.

Installation and Tuning

Installing new downpipes on your RS6 C8 requires precision and expertise. The process involves removing the stock exhaust components, disconnecting oxygen sensors, and fitting the new pipes. It’s essential to use proper gaskets and ensure all connections are secure to prevent leaks.

While experienced enthusiasts may handle the installation themselves, professional installation is highly recommended. After installation, an ECU tune is usually required—especially for catless systems—to prevent check-engine lights and optimize engine performance.

Choosing the Right Downpipes