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Fast Intentions is proud to present our B8 S5 Cat Back Exhaust System.

This Cat Back exhaust system is the premier upgrade for all S5 owners looking to maximize the performance from their 4.2L FSI V8 or 3.0L TFSI V6 engine. Our exhaust system will enhance the sound that Audi created from the factory by making it smoother, deeper, and louder.

Built as a direct OEM replacement, our exhaust system is easy to install with simple hand tools; no cutting or welding required. Our X Pipe is designed to increase low end torque and maximize power throughout the entire RPM band. The exhaust system is unobtrusive at idle and cruising speeds; but comes to life at wide open throttle. Our exhaust system gives your Audi S5 that exotic sound associated with European sports cars. With the addition of our exhaust system, you will improve the aesthetics of your vehicle with its sporty and classy appearance.


  • Direct OEM replacement: no cutting or welding required.
  • 2.5" T-304 mandrel bent stainless steel tubing.
  • 5" x 9" oval, 12" long polished stainless steel perforated core mufflers.
  • 90mm dual wall, straight cut, stainless steel exhaust tips available in polished or milled/brushed finish.
  • All flange connection points are precision Tig welded around the outside.  The inside is sanded down and port-n-polished for a smooth exhaust flow.  This process reduces exhaust turbulence at the flange connection points.
  • Non resonated or 12" stainless steel perforated core resonators within the exhaust system. Resonators reduce interior noise without affecting performance.
  • Limited 3-year warranty on all welds, craftsmanship, mufflers and tips.
  • Application Specific: 2008-2012 B8-S5 4.2L V8
  • Application Specific: 2013-2016 B8-S5 3.0L V8
  • Not compatible with Cabriolet models.
  • All installation hardware included.
  • Hand built in the USA.


  • Improved exhaust flow and throttle response.
  • Refining the factory exhaust note by increasing depth and volume.
  • Reduction in EGT's (Exhaust Gas Temperature) by freeing up back pressure.


  • This product is hand built (in house) to order with a standard lead time of 2 - 4 weeks. Once your order is placed, you will receive an invoice with your estimated shipping date. Note: The lead time may fluctuate less than 2 or greater than 4 weeks based on order volume.
  • California customers are subject to sales tax.
  • Customers outside the continental U.S. are subject to additional shipping charges.
  • Image(s) shown may not reflect actual product.

Additional information

Weight 50 lbs
Dimensions 57 × 19 × 16 in

Non Resonated, 12" Resonators

Tip Finish

Polished, Milled/Brushed