Quote Originally Posted by nik12937 View Post
Do you mean the stock downpipe? I think it may be 2.25 in but I'm not completely sure. The 3 in ZZP down pipe really is 3 in, until the end where it bolts to the stock cat back. If it's a bolt in, it tapers to 2.5 in at that end.
I meant the ZZP. I guess I better wait until I can measure the diameter where the mount will be placed.