My sidepipes measure 3 1/2" OD, 3 3/8" ID and have the West Coast restrictive 1 7/8 internal baffle. Replacement baffles are apparently 3 1/2" OD, and replacement mufflers commonly 4". I'll call Eric at Classic Chambered to find out more.
First I don't see how to put a 3 1/2" baffle inside of a 3 3/8 inch ID sidepipe (Is this a Vern Redel special?)
Secondly I hadn't noticed most cobras using 4" mufflers or sidepipes, what's on your cobra?
Thanks,
Dirk