Alright guys, need help on this one....I need to know peeps opinion about getting a custom exhaust (2.5" piping from the cat back to the muffler, and not sure which muffler yet...) or should I get a brand name one (like Greddy, Brospeed, or another one...)?? I need your help....I think if I get a custom one, i may save quite a few G's, but will it give me the same hp like a Greddy would? One of my friends has a 3000GT and he has a custom exhaust. What about for the 6, should I go with it? Need some feedback from you all! Thanks alot...peace.