Integrated Engineering B8 / B8.5 Audi S4, S5 3.0T Downpipes

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This is a Race-only product. By adding this product to your shopping cart, you are electronically acknowledging that this product is not to be installed on any registered vehicle that will be driven on any US road, street or highway. In addition, you also acknowledge that the use or installation of this product outside of the intended closed circuit racing purpose may be illegal under the Federal Clean Air Act (42 U.S.C. § 7522(A)(3))

To purchase this product, you must fill out and e-mail the form at the link below to We cannot ship this product to you without a completed form.

Track Car Modification Waiver Form


Integrated Engineering B8 / B8.5 Audi S4, S5 3.0T Downpipes


  • Deleting two resonators creates a deep and assertive exhaust note
  • Horsepower gains of  8-12 HP
  • Constructed from 304 stainless steel 2.5 inch (65mm) diameter tubing
  • Easy to install - do it at home with minimal tools
  • Tig welded, high quality, and long lasting
  • Fully lined flex section - will never collapse and supercharger approved
  • Includes all hardware and clamps needed for a hassle free install


Downpipes are a popular and easy mod to install. As a pair they replace roughly 12 feet of factory tubing and a pair of resonators. This frees up the exhaust system, making the engine sound as it should. On the B8 S4, the downpipes are located after the catalysts and before the center muffler. Due to copious amount of exhaust on the B8 S4 we have made the following diagram to simplify the system.

B8 3.0T Downpipes


Increasing the tubing size and deleting two sound muffling resonators results in noteworthy gains of 8-12 horsepower and torque (ft lb). Larger gains may be realized on more aggressive setups such as stage 2 or stage 3 vehicles.


From the factory the B8 S4 is muffled and resonated to death. In its stock state the car is so quiet that it’s possible to forget about the performance minded 3.0T powerplant. By removing the two resonators the engine sound comes to life. If you’re a true enthusiast that loves a deep and throaty exhaust note, you will not be disappointed!


304 Stainless steel tubing and tig welding make for a long lasting and worry free product. High quality lined flex sections will never come apart internally and clog your exhaust like inferior flex sections. Especially in forced induction (supercharged or turbo), economy flex sections are bound to fail and cause performance issues.


No welder or sawzall required! It’s sad that we even have to mention this, but it’s a fact that many cheaper products often require modification to be installed. For a hassle free install, go with IE who stands behind their products.


One of the greatest features of IE downpipes is that they are a breeze to install. They can be done with minimal tools in your garage (or driveway) on jack stands. Feel free to view our install guide HERE.


*Power figures are on IE dual pulley and tuned S4 cars. Power measured at the hub performed on a hub dynamometer, power figures are taken from multiple vehicles. Power gains may differ from advertised as individual vehicles will vary in maintenance, mileage, and conditions. HP=horsepower, TQ= Torque ft-lbs.

Integrated Engineering B8 3.0T Downpipes Dyno

Integrated Engineering B8 3.0T Downpipes Dyno


  • Audi - S4 2009-2015 (B8 - B8.5) 3.0T
  • Audi - S5 2008-2015 (B8 - B8.5) 3.0T
  • Audi - SQ5 2008-2015 (8R) 3.0T
  • Audi - Q5 2008-2015 (8R) 3.0T

Vehicle fitment is confirmed for the US and Northern America (NA) fitment. Some Rest Of World (ROW) models may have incompatible exhaust systems. Please verify factory part number compatibility with US models before ordering or contact us for support with any fitment questions.

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