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.

Starting at the turbo discharge this 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 the 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. The 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 a 2.55" adaptor. This adaptor fits stock exhaust and all aftermarket catbacks.