WARNING: Cancer (and/or Reproductive Harm)

    SKU: N/A Categories: , ,

    Fast Intentions is proud to present our B6 S4 6MT Catted Downpipes.

    These down pipes are the premier upgrade for all S4 owners looking to maximize the performance from their 4.2L FSI V8 engine. Our down pipes effectively increase low end torque and maximize power throughout the entire RPM range. Your overall exhaust volume will increase, while creating a deeper and smoother tone commonly associated with exotic European sports cars.

    Built as a direct OEM replacement, down pipes are designed to be an addition to your cat back exhaust system. We maximize performance by using a less restrictive catalytic converter and increasing tubing diameter to free up back pressure.


      • Direct OEM replacement: no cutting or welding required.
      • 2.5″ T-304 mandrel bent stainless steel tubing.
      • The catalytic converter is a 300-cell metallic core incased within a spun stainless-steel shell.
      • 49 state OBD II compliant.
      • J-Bend style O2 sensor anti fouler to ensure CEL (Check Engine Light) stays off.
      • 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.
      • Optional Full 2.5″ connection.
      • Limited 3-year warranty on all welds and craftsmanship.
      • Application Specific: 2003-2005 Audi S4
      • Downpipes are sold as a set of 2: Left / Right
      • Gaskets and hardware are included.
      • Hand built in the USA.


      • Improved throttle response and power.
      • 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.
      • This product may not be legal for highway use on pollution-controlled motor vehicles.
      • Not legal to purchase in the state of California.
      • Customers outside the continental U.S. are subject to additional shipping charges.
      • Image(s) shown may not reflect actual product.
    Connection Size