hey, got a black 99.5 A4 avant 1.8T 5 speed, with apr 93 octane chip, evo cold air (somewhat custom install), milltek 2.75in turbo back exhaust, and a hyperboost diverter valve. i recently blew my turbo, my cat, and my clutch by trying to compensate for 93 octane on the west coast with race gas, would have been fine with the VP 104 octane i was running, but a dumbass accidently put 108 leaded in her, needless to say it was all over from there. so, with that said, the "bat mobile" is gettin new upgraded turbo, new high flow cat, and an atpturbo high performance clutch. i am leaning towards the gt28rs kit from atp, not sure on the cat. any suggestions or kits that r better than the 28?

 

welcome.

 

Welcome. Look up TomRitt .

He's got a very good understanding of the Larger Turbos in the A4. Do some searches for his posts.