I want to get the down pipe for my 92ztt.But i was wondering do you guys think it would be a better idea if i got my friend who has a local custom exhaust shop to build me one.Its the one that goes right at the end of my turbos. or should i just buy one already made for my car. i figured it would be better to get one custom made because he can see and messure how to fit it perfect.But would it still get all the 40hp that the ones people sale on the sights. Please help.I want to get this done this weekend or next. thanks everyone.