When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
I believe the ZZP DP is actually a 3", with a 2.5" flange. And yes, it should bolt up just fine to the stock exhaust (both manifold and cat-back). Mine fit great, and I love it !