next week im buying the 3" atp cat delete downpipe and i have a few questions. first who has it and what gains did you see out of it. second how hard is it to install, and third do you think it would help at all if i heat wrapped it before i put it in.
thanks

by the way i drive a 01 a4 1.8t fwd

 

we discuss about it many times, search it. you could find many people's feedback about it.

 

Its a pain in the damn *** to install, but the gains are really nice... and I wouldnt wrap it