Hello,
Been wanting to mod my 04 grand prix gtp "compg". Been hearing a lot of good things about adding a downpipe. Was just wondering since I have to worry about emissions would it still be okay to add it. Saw the ZZperformance downpipe that has cat and bolts on. Was also curious if anybody knows if with my stock ehaust does it just entail un-bolting that section and bolting the new downpipe on with no welding?