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    Fast Intentions is proud to present our B5 S4 Cat Back Exhaust System. This Cat Back exhaust system is the premier upgrade for all S4 owners looking to maximize the performance from their 2.7L V6 Bi-Turbo 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 S4 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″ & 3″ mandrel bent stainless steel tubing.
    • 12″ twin bullet style stainless steel perforated core mufflers.
    • 88mm dual wall polished stainless steel exhaust tips.
    • 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.
    • Standard neck down connection on the front of our Y Pipe which bolts directly to the factory down pipes.
    • Optional Full 2.5″ connection on the front of our Y Pipe which bolts directly to our down pipes with NO neck down.
    • Limited 3-year warranty on all welds, craftsmanship, mufflers and tips.
    • Application Specific: 1999-2002 Audi S4
    • All gaskets and hardware included.
    • Hand built in the USA.


    • STAGE 1 Quietest: Polished stainless-steel muffler. This option is recommended for the enthusiast who want the interior noise level at an absolute minimum.
    • STAGE 2 Mid-Level: 12″ Resonator. This option is our most popular. It is for the enthusiast who wants the sound level slightly more aggressive under partial and wide-open throttle.
    • STAGE 3 Loudest: Straight through 3″: This is considered our “Race” option. The sound level is still reasonable under normal acceleration and cruising speeds. However, at wide open throttle your Audi S4 will sound like a finely tuned race car with an intoxicating exhaust note.


    • 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 3 – 5 weeks. Once your order is placed, you will receive an invoice with your estimated shipping date. Note: The lead time may fluctuate less than 3 or greater than 5 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.
    Connection Size


    Mid pipe

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