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Integrated Engineering Audi B8/B8.5 A4, A5, Q5 2.0T Downpipe System

Integrated Engineering
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
Now $552.49 Regular Price $649.99

IE A4 A5 Q5 B8/B8.5 2.0T 3” Catted Downpipe

Add horsepower and take your B8 A4, A5, or Q5 to the next level with an IE High-flow Downpipe and stage 2 ECU tune. The IE 3 inch stainless steel downpipe is comprised of only the best materials and quickly bolts on. It also uses a high-flow performance catalytic converter that reduces unpleasant smells and cabin drone.

Product Features

  • Substantial power and torque gains - with matching IE ECU tune 
  • Bolt-on system - mates to your stock turbo flange
  • 1/16” thick 304 stainless steel piping - long lasting and worry-free performance 
  • Thick turbo flange - 16mm flange prevents warping and leaks 
  • High flow CAT - reduces emissions and unwanted smells 
  • Interlock core tough flex section - allows engine movement without failing or cracking 
  • 3” to 60mm adapter - easily adapts to your stock exhaust system
  • All install hardware included - no last minute trips to the hardware store


  • AUDI - A4 2009-2015 (B8 - B8.5) 2.0T engine
  • AUDI - A4 Allroad 2009-2015 (B8 - B8.5) 2.0T engine
  • AUDI - A5 2008-2015 (B8 - B8.5) 2.0T engine
  • AUDI - Q5 2009-2017 (8R) 2.0T Gen 2 engine
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.

IE B8 & B8.5 2.0T Downpipe Overview

Equipping your B8 A4 or A5 2.0T engine with an IE catted downpipe delivers additional horsepower, torque, and responsiveness when paired with a matching Stage 2 ECU tune. These significant power gains are added through the entire RPM band by allowing the turbocharger to flow freely through the 3" downpipe, high-flow catalytic converter, and mid-pipe. Careful tuning of the added sound from freeing up exhaust flow rewards you with an aggressive exhaust growl every time you accelerate while minimizing cabin drone. All IE exhaust systems are designed in-house using state of the art digital scanning for a perfect fit and manufactured from 1/16” thick wall 304 stainless steel offering a lifetime of performance and fun.

B8 & B8.5 3” Downpipe Power Gains

B8 & B8.5: Gains of approximately 25-30 HP & FT-LB over stage 1 on stg 2 IE ECU Tune/Software

*Power figures are on full bolt-on and tuned Stage 2 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.

High Flow Catalytic Converter

IE's performance downpipe includes a high-flow 200 cell per inch metal matrix catalyst on the mid pipe section. This included cat greatly reduces emissions output and unwanted smells that are common on all catless systems, without losing horsepower! Have all the benefits of catless performance and none of the drawbacks with the IE high-flow cat system.

Direct bolt-on downpipe with perfect fit

The IE downpipe replaces the majority of the factory exhaust from the turbocharger all the way back to the factory exhaust just before the rear axles. The downpipe section includes a new mount bracket and utilizes the factory mount points along with a tough interlock core flex section, this allows engine and chassis movement without stressing or cracking your downpipe. Easily connect the downpipe and catted mid-pipe using the simple and strong v-band connection. Finally, the mid pipe mounts to the stock rear exhaust with the included 3" to 60mm slip-fit sleeve, or easily adapt it to your cat-back exhaust of choice. In-house digitally scanned and designed for an exact fit and includes all hardware to make the install easy and straightforward.

This product is not CARB approved or for sale within California.

More Information
Brand Integrated Engineering
Stock Type N/A
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