The one I have is center IN, OUT. 2.25ID, 5X8 body, 14" long, p.n.. 14215 (All the mufflers that start with 14 are SS) I also have a 18" perf core resonator, and I do get *some* rasp as I pass 4k under hard acceleration. It's fine while cruising, very quite :) Jon Pennington wrote: > > Oh BTW I noticed no "raspiness" and I am still N/A. > Which muffler model and size (I/O, shell, etc)?