i need cat back for a 03 audi tt ... heeeelllpp
 

ok i just got this 03 tt. last week.. i want cat back for it.. i want it to sound like a Porsche gt3. also i hear cat back will get ride of lag. in the turbo???? and i aso would like an inercooler?? wil all this be safe for a stock motor??? 1.8t 180 hp...

RE: i need cat back for a 03 audi tt ... heeeelllpp
 

do the downpipe first, more hp gain and improved sound. catback doesnt do as much as downpipe, but if you can do the whole exhaust.