I did my Google searching and found about 2 or 3 threads saying the the 550k headers are 1.25 inch OD and others saying 1.5 inch. I just want to confirm if which is right. It was hard to find the some threads on the topic. I just need to know this as I plan on fitting these on the stock headers.
http://www.amazon.com/gp/aw/d/B000GU25Y8It says it fits 1 3/4 and 1 5/8 so I'm thinking I may have to just make shims for these.
Cheers.
