TNEER Valvetronic Exhaust System for Audi RS6 Avant / RS7 Sportback (C8) 2020+

TNEER Valvetronic Exhaust System for Audi RS6 Avant / RS7 Sportback (C8) 2020+

The Audi RS6 Avant and RS7 Sportback C8 are built around a 4.0-litre twin-turbocharged V8 producing 591 horsepower, the EA825 engine featuring 48-volt mild hybrid technology and cylinder deactivation that manages the V8's thermal and efficiency demands across its full operating range. The RS6 Avant's estate body and the RS7 Sportback's fastback coupe configuration represents two distinct approaches to the same high-performance platform, sharing the MLB Evo architecture while presenting specific underbody packaging differences between the two body styles. The mild hybrid integration adds electrical system complexity to the exhaust routing environment that the previous C7 generation did not present, with the 48-volt belt-integrated starter-generator and associated componentry creating additional packaging constraints specific to the C8 platform. TNEER engineers this valvetronic system to accommodate both the RS6 Avant and RS7 Sportback C8, with mid X-pipe placement and mounting geometry developed to the exact chassis layout shared across both body configurations.

Each section is formed from single-piece high-grade stainless-steel tubing using robotic pipe bending technology, producing continuous tube geometry throughout the system without the weld joints and flow disruptions of multi-segment construction. The mid X-pipe cross-links both exhaust banks at the mid-system junction, balancing pulse energy between the V8's cylinder groups. On a twin-turbocharged V8 platform with cylinder deactivation, mid-system pulse balancing through an X-pipe contributes to both exhaust flow efficiency and tonal coherence across the rev range, maintaining consistent acoustic character regardless of whether the V8 is operating on four or eight cylinders. The system installs to all factory mounting locations across both the RS6 Avant and RS7 Sportback body configurations, requiring no structural modification and maintaining correct chassis alignment throughout.

The ECU-controlled valvetronic rear mufflers manage acoustic output through the RS6 and RS7's existing drive mode architecture without secondary controllers or aftermarket modules. Valves closed, the system maintains a composed tone appropriate for road use and the broad daily operating profile of both platforms, while presenting more of the twin-turbocharged V8's character than the factory exhaust allows at any throttle position. Valves open, the full acoustic output of the EA825's 4.0-litre twin-turbo V8 is unobstructed and responds directly to throttle input and engine speed. The C8 generation's EA825 in RS specification produces a more refined and acoustically developed character than the C7's EA824 it succeeded, and this system presents that character at its full expression without factory exhaust attenuation on every drive.

Two tip configurations are available to complete the system at the rear fascia of both the RS6 Avant and RS7 Sportback. The dual silver tips provide a clean, high polish finish consistent with the RS model's performance aesthetic. The dual black nickel plated tips present a darker, more understated alternative for owners whose build direction calls for a more restrained visual finish at the rear, complementing both standard and modified C8 builds across both body configurations.

Optional Downpipe Configurations

For owners who want to address the primary restriction point in the exhaust path, TNEER offers two downpipe specifications that deliver meaningful performance and acoustic improvement beyond what the mid X-pipe and valvetronic muffler system alone provides.

• The race downpipes remove the factory catalytic converters immediately downstream of the turbocharger outlets, where back pressure reduction has the most direct effect on turbine behavior, spool characteristics, and mid-range torque delivery. On the EA825's twin-turbocharged V8 at 591 horsepower, the relationship between downstream restriction and turbocharger efficiency is immediate and measurable at every point in the rev range. These components are intended for closed course and off-road use.
• The 200-cell sport downpipes retain a high-flow catalytic substrate in place of the factory units, reducing restriction significantly while maintaining a level of emissions compliance appropriate for street-driven builds. For RS6 Avant and RS7 Sportback C8 owners who require a balance between full-system performance and daily usability, the 200-cell specification delivers a substantive upgrade within a practical operating profile consistent with both platforms' intended use character.

All downpipe components are fabricated from high-grade stainless steel and engineered to the same fitment standard as the valvetronic muffler system.

About TNEER:

TNEER is built around a single engineering conviction: the exhaust system is not a peripheral component. It is the primary interface between the engine and the driver's experience of it. Every system TNEER produces is developed to bring out the true voice of the engine it is built for, improving exhaust flow and delivering a distinct tone that is mechanical, raw, and directly connected to the character of the car.

The manufacturing process that defines TNEER's fitment standard is their high-tech robotic pipe bending technology. Rather than fabricating exhaust routing from multiple welded sections, TNEER forms each tube from a single continuous piece, bending high-grade material to navigate the spatial constraints of each specific engine bay without the diameter reductions, flow disruptions, and structural inconsistencies that welded multi-piece construction introduces. The result is an exhaust system with continuous tube geometry, perfect fitment to the platform it is built for, and no compromises in the routing that precision bending makes unnecessary.

For enthusiasts who regard sound and performance as inseparable elements of the driving experience, TNEER engineers each system to deliver both from the first throttle input.

Note:

• Downpipes are not CARB certified and may not be legal for use on emissions controlled vehicles; intended for off road use only.
• ECU tuning may be required due to removal of factory catalytic converters.

Fitment:

• Audi RS6 Avant (C8) 2020+
• Audi RS7 Sportback (C8) 2020+