Originally posted by NeilsCougar:

a polite 'neil is mistaken' would have sufficed.

If the CAT flange is 3 bolt, wouldnt the mating flange on the exhaust side have to have 3 bolts too? Therefore if you got a '99 style Y-pipe and installed it on your 02 wouldnt there be a mismatch?




No. The ypipe, bolts to the cat, which bolts to the exhaust. The Ypipe-to-cat flange is 3 bolt, the cat-to-exhaust flange is 2 bolt.

If you took a complete 99 ypipe assy (y and cat), even a 2-bolt and put it onto my 2001 cougar for example, it would technically fit fine, but since I dont have any upstream o2 sensors on my 2001s ypipe i would need to plug the one thats in the 99 y, and drill a hole and add a bung for a sensor after the cat.

~nick 2001 Cougar V6 MTX 3L Cougar.