42 Draft Audi TT 225 Quattro 3” Downpipe | EXT125DP


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42 Draft Designs

Part# EXT125DP

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Picture shown WITH High Flow Catalytic Converter.

The Audi TT 225 comes equipped from the factory with a K04-20 turbocharger and Quattro driveline. While a great combination for making power and keeping it on the ground, the two leave very little room for a large exhaust system. The factory 225 downpipe starts out over 3" in diameter, but quickly reduces and splits into two smaller pipes. These two pipes twist to clear the driveshaft and meet up with two small catalytic converters. 2.55" exhaust piping finishes up the remainder of the downpipe. While larger than a stock GTI downpipe, we certainly wouldn't call the stock 225 downpipe 'performance.' In fact, the stock K04 is simply begging for a 3" upgrade.

To date, a 225 3" downpipe has been tackled by few. Tight fitment and custom fabrication costs have kept most from attempting the project. We certainly understand why! Fitment is beyond tight. From the turbo to the stock cat-back exhaust there is barely room to spare. Our downpipe slides in with precision. Every angle of installation has been addressed making this 3" downpipe upgrade truly worth the effort.

Starting at the turbo discharge our downpipe bolts up with a CNC machined turbo flange. A tight radius bend at the turbo quickly sends exhausts gases flowing downward while also steering clear of critical engine bay components. The first bend has been positioned so that normal hand tools can be used on all bolts. Next, a flex pipe joins from the bottom. The top flange of our flex pipe is studded for ease of installation. Both the flex pipe and the downpipe feature adjustable flanges. These custom flanges allow for precision adjustment and ensure perfect fitment on every TT. Our cat section bolts up next, tucking a Magnaflow 3" high flow cat beside the driveshaft and well off the ground. The cat pipe bends towards the center of the car and bolts up our 2.55" adaptor. This adaptor fits stock exhaust and all aftermarket catbacks.

Our 3" downpipe upgrade has been designed to squeeze all available power from a street or track driven TT. Horsepower and torque increases are estimated at 15hp and 15ft/lbs at the wheels. Power increases can be felt instantly after installation. Midrange and top end power increases dramatically while almost no low end power loss is felt. Boost builds steadily without a major spike in pressure.

Street series downpipes include a high-flow cat. Test pipes and cat sections are available separately for those who wish to change at a later date. Thanks to our modular flange design the cat can be easily removed on race day and reinstalled for street use.

Dyno results are in!

Joe Lucchio of Fourtitude/VWVortex put our downpipe to the test. With his current modifications the dyno showed 9.3 hp and 19.3 ft/ lbs peak gains at the wheels. Gains were proven throughout the RPM range and driveability was greatly improved. To read Joe's complete review check out fourtitude's full feature. To view a full size, un-altered dyno sheet click here: TT225 dyno chart


  • CNC mandrel bent 14 gauge aluminized steel tubing
  • CNC machined 3/8" steel flanges
  • 100% TIG welded construction
  • Included 2.55" adaptor allows fitment of any TT cat-back
  • Stainless steel braided flex section
  • Magnaflow high flow catalytic converter (Street Series)


  • Fits 2001-2006 Audi TT 225 Quattro
  • Custom adjustable flanges allow for precision fitment in every TT 225
  • Available in street configuration
  • 3 triple layer gaskets included
  • 5/16" corrosion resistant hardware included

This downpipe will NOT fit 180 FWD or 180 quattro TTs. The 225 exhaust layout is unique to the the 225. This downpipe will fit no other TT or VW.

42 Draft Design is a manufacturer of high performance parts and accessories for VW, Audi, Porsche, and BMW vehicles. From exhaust and intakes to custom catch cans and billet aluminum engine parts, 42 Draft Designs covers it all and prides themselves on never cutting corners, always delivering the best possible products to enthusiasts.

42 Draft Designs products are manufactured from scratch in Millersville, MD. We use high-quality American-made materials throughout our products, manufacturing in-house every component possible. When necessary to outsource, we start with American companies that manufacture their products in the USA. Our modest manufacturing facility is staffed by a team of 12 machinists, metal fabricators, and TIG welders trained to work in exacting precision. From design to manufacturing we never rush, cut corners, or take shortcuts.

Due to growing demand for our products, lead times may exist.

Most items with a lead time are considered 'Made To Order' items and are subject to an early cancelation fee and a restocking fee if returned.

⚠️CALIFORNIA WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov

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