Audi S4 (B8/8K) - Rear Diff Audi S4 (B8/8K) - Rear Bush Insert BTT Non-resonated (louder) or Resonated (quieter)

Non-resonated (louder) or Resonated (quieter)

reliable Bosch Injectors Excellent response characteristics Robust Design High Impedance Low Impedance performance characteristics with High Impedance Compatibility RS Owners looking for 385bhp +

RESONATED OR NON - RESONATED CAT BACK EXHAUST SYSTEM

THE BTT MOTORSPORT MOUNT HAS BEEN CAREFULLY DEVELOPED USING OUR OWN TEST VEHICLES BOTH ON THE ROAD AND ON TRACK APPLICATIONS

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Audi S4 (B8/8K) - Rear Diff Audi S4 (B8/8K) - Rear Bush Insert BTT Non-resonated (louder) or Resonated (quieter)This is an insert that fits into and fills the original voids in the original bush.