APR FE100041 2.5" Catback RSC Exhaust for Audi B8 S4

The APR FE100041 B8 S4 RSC Exhaust is a stainless steel, 2.5" mandrel bent, cat-back exhaust. Power gains on OEM software are very impressive with gains of up to 18hp and 16lb.ft of torque!

Reflective Sound Cancellation allows for maximum exhaust gas flow while completely eliminating in cabin sound resonance (drone). RSC™ incorporates innovative technologies developed in conjunction with NASA. With limited use of packing materials and no baffles, RSC™ allows for a completely straight and free flowing exhaust path through the RSC™ mufflers. Reflective Cancellation bounces the undesirable sound waves into each other to attenuate the wave and completely eliminate the low frequency tones that create drone. Each RSC™ muffler is tuned to eliminate specific, undesirable sound frequencies allowing only the engine's desirable exhaust notes to be heard and improving performance.

Unique Exhaust Tip Options:
APR's RSC™ Performance Exhaust for the B8 S4 introduces modular tip design that allows the end user to specify an initial tip color of either Stainless Steel or Diamond Black and other tips can be ordered separately and changed at the owner's pleasure. Be on the lookout for special edition, limited run tip options in the future to make your S4 even more exclusive and individual to your tastes. Installation and removal of exhaust tips can be accomplished easily with only basic hand tools.

Integrated Elliptical Crossover Assembly (X-pipe):
Normally Aspirated engines and Supercharged engines still rely on proper exhaust tuning to promote the optimal flow velocity of exhaust gasses leaving the exhaust ports. APR introduces a unique and proprietary X-pipe design that was developed through multiple reiterations to perfectly match the pulse of each cylinder in the 3.0T to provide optimal exhaust flow. Often times, exhaust manufacturers will incorporate X-pipes into all Normally Aspirated or Supercharged applications generically without realizing that the sizing and shape of the ports in the X-pipe require specific tuning to each engine application. APR's Engineering Team has discovered a trade secret exclusive to APR's RSC™ Exhaust System that promotes maximum velocity of exhaust gasses by way of the X-pipe to ensure your APR RSC™ Exhaust System will compliment your future modification choices at even the highest horsepower and torque possible.