You will not find a better-fitting exhaust anywhere! MTM uses the shell of the OEM exhaust and redesigned the internals, therefore absolute fitment is guaranteed! This is the highest quality exhaust available for the 2002 A4 1.8t. Exhaust systems are critical to turbocharged engines. The MTM 70mm stainless steel exhaust system is carefully designed and tuned on MTM’s chassis dyno to ensure the exhaust, engine and ECM software work in harmony. The exhaust note is more aggressive but not intrusive, and without the annoying drone present in some aftermarket systems. Includes ECM Software, Injectors and Exhaust.