Alright thanks for the help man, ya im about to order them just didnt know the quality and the fitment, but i guess there good, the only thing now is if i want 2.5 or 3 inch exhaust lol to many things to think about, i didnt see any 3 inch exhaust at z1, but will see i think im gonna research a little bit more

The downpipes and test pipes were awesome. My exhaust is straight pipes all the way back to mufflers at the rear. It sounds mean, Also when you put the z1 dp's on it gives you allot more room underneath in that area, because the stock pre-cats are so big. I had no issues with installation, My boost seems to hit allot faster as well, definitely worth it IMHO. When removing the old nuts off the studs on the turbo, make sure you use a torch to heat them up, then you wont have problems with broken studs.

Hey just noticed that you had the z1 dp and test pipes i just wanted to get your opinion on them as im looking to do the same, thanks