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APR Catback Exhaust System | B9 A4 · A5Introducing the APR Catback Exhaust System for the Audi B9 S4 and S5! The APR Catback Exhaust System for the Audi B9 S4 and S5 is a complete, high performance exhaust solution that runs the entire length of the vehicle from the catalyst back. Inspired by the larger center pipe design of the higher output RS4 and RS5 models, this system is engineered to boost performance, elevate sound, and enhance aesthetics with customizable exhaust tips that are

as well as side-to-side chassis flex during spirited driving

Large CNC-machined billet-aluminum catch can

These Integrated Engineering camber plates allow maximum adjustability of camber

Black finishes

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and when extra support is needed

pressure drop typically begins to climb

Whiteline Springs deliver improved vehicle performance whilst maintaining safety and ride quality characteristics

This advanced ECU calibration

ARM Motorsports 7" Front Mount Intercooler

ARM Motorsports Downpipe

This is why H&R ride development engineers have crafted lift springs