Audi B9/B9.5, RS4/RS5 Stainless Steel Valved Catback Exhaust

Audi B9/B9.5 RS4/RS5 Stainless Steel Valved Catback Exhaust

Give your Audi RS4 or RS5 the voice its 2.9L twin-turbo V6 deserves with this Stainless Steel Valved Catback Exhaust System, engineered to free up exhaust flow and transform the character of the car without compromising everyday usability.

The factory B9 exhaust is heavily silenced, and the 2.9T spends most of its life sounding far more subdued than the engine actually is. This system replaces the restrictive rear section with a free flowing design that lets the V6 breathe, unlocking the harder, deeper tone the standard car keeps hidden.

An independent Varex valve system, controlled by remote, puts you in complete control of how loud the car is at any moment. Closed, it is calm enough for a cold start in a quiet street. Open, it delivers the full character of the engine under load.

Every section is manufactured from stainless steel with a mirror polished finish and precision TIG welding throughout, built to handle sustained heat while retaining the factory mounting points and tip positions for a clean, bolt on installation.

Whether your car is otherwise standard or running downpipes and a tune, this system delivers the sound the platform is capable of while remaining completely usable every day.

Key Features

Independent Varex Valve System

Rather than reusing the restricted factory valves, this system operates its own dedicated valve assembly with complete travel in both directions. Sealed when closed for quiet running, and fully unobstructed when open for maximum flow and volume. Switch between a refined daily-driving experience and an aggressive performance exhaust note at the touch of a button.

Stainless Steel Construction

Corrosion resistant stainless steel throughout for long term durability under sustained high exhaust gas temperatures.

Mirror Polished Finish

A clean, high quality finish across every visible section of the system.

Improved Exhaust Flow

Removes the restriction of the heavily silenced factory rear section and lets the 2.9T V6 breathe far more freely.

Precision TIG Welded

High quality welds engineered to withstand extreme temperatures and demanding performance use.

Mandrel Bent Tubing

Maintains a consistent internal diameter through every bend so flow is never choked.

Direct Bolt On Fitment

Designed for the B9 platform using the factory mounting locations and hanger positions.

Performance Benefits

• Increased exhaust flow efficiency
• Sharper throttle response
• Deeper and more aggressive twin-turbo V6 tone
• Reduced exhaust restriction
• Ideal supporting modification for downpipes and ECU tuning
• Full daily drivability retained through valve control

Performance gains may vary depending on ECU calibration and supporting modifications.

Sound Characteristics

Valves Closed

• Refined OEM+ exhaust note
• Minimal drone for comfortable daily driving
• Discreet enough for early starts and residential streets

Valves Open

• Deep, aggressive twin-turbo V6 tone
• Substantially greater volume under acceleration
• Enhanced crackles and pops when tuned
• More pronounced cold starts
• Strong character throughout the rev range

Vehicle Fitment

Audi B9 / B9.5 RS4 Avant (2017-2023)
Audi B9 / B9.5 RS5 Coupe (2017-2023)
Audi B9 / B9.5 RS5 Sportback (2017-2023)

2.9L Twin-Turbocharged V6

Which Option Do I Need?

Select the body style of your car. The RS4 Avant, RS5 Coupe and RS5 Sportback have different rear sections, so the exhaust is not interchangeable between them.

If you are unsure, send us your VIN and our team will confirm the correct system before dispatch.

Please Note

Professional installation is strongly recommended.

Exhaust sound characteristics may vary depending on supporting modifications such as downpipes and ECU tuning.

Why Choose Proven Performance Parts

We specialise in high-performance parts for European vehicles — including Volkswagen GTI & R models, Audi S/RS platforms, and BMW M vehicles. Every product we offer is carefully selected for its quality, fitment, and real-world performance — tested by enthusiasts, for enthusiasts.