Quote Originally Posted by jacobmh27 View Post
the only one they offer on the site is with a 3" dp
All of the common headers use 3" d/p setups included with their collector design. They use an adapter at the cat-back flange to go to 2.5" for working with any stock/aftermarket exhaust meant to be interchangeable. If you had a 3" exhaust, you'd just need to do a different flange at the last piece of the setup.

- Dave