Web in this video i show you the process involved in running a catless test pipe in a 2010 audi a4 with the 2.0t engine. Web home / audi / 2.5″ catless downpipe for audi a4 b7 2.0t audi 2.5″ catless downpipe for audi a4 b7 2.0t $ 189.99 ex. Web in today's video, we install a catless downpipe on aki's audi a4 b7, it makes the exhaust sound so much better while actually increasing performance and hors. Description reviews (0) product description: Vividracing is the place for air intake, suspension, turbo, wheels,tires,.