Milltek Sport Audi RS4 B8 4.2 FSI Cat-Back Exhaust System

The B8 RS4's naturally-aspirated 4.2-litre FSI V8 is genuinely a high-revving, characterful engine, and the factory exhaust leaves real drama on the table, tuned as much around noise regulations as outright sound. Milltek Sport's Cat-Back exhaust replaces everything from the catalytic converter rearward, engineered to deliver genuine gains in flow, sound, and weight over the factory system, letting this naturally-aspirated V8 sing the way it genuinely deserves to.

Constructed entirely from T-304 stainless steel, this system is built to outlast the car itself, resisting the corrosion that eventually catches up with mild steel factory systems, especially through wet European winters. Milltek's own sound engineers spend considerable time tuning each system's resonance and tone, striking a genuine balance between a purposeful V8 character and everyday drivability, avoiding the drone that can plague poorly engineered aftermarket systems on a long motorway drive.

Please select your type at checkout: Resonated (the most refined, restrained everyday character), Non-Resonated (noticeably louder and more aggressive), or US-Spec (a dedicated configuration engineered for the US-market RS4).

Why Choose This Exhaust System

• Genuine gains in flow, sound, and weight over the factory system
• T-304 stainless steel construction throughout, built to outlast the factory system
• Milltek's own sound engineering, letting this naturally-aspirated V8 sing properly
• Dedicated US-Spec configuration available for the US-market RS4

Compatibility

• Audi RS4 (B8) 4.2 FSI Quattro Avant