PontiacBonnevilleClub.com

I have searched but can’t find an answer to this specific question: what ID size is the down pipe from the manifold to the cat? If there’s a thread, please point me to it, as there will be more to read and possibly learn from. Thank you!

2000 SSEi

-Ryan

I looked on the ZZP site and they claim the inside diameter of the factory downpipe from the manifold to the cat is just a little over 2". Hope that helps

It does, thank you. I hadn’t thought to look on their site.