Has anyone actually ever measured the od of the pacesetter cat-back? I had an awfull buzz from my exhaust, so I bought a 2 1/4" glasspack to replace my resonator. Much to my surprise it wouldn't fit my pipes. My friggin pipes are 2". I measured afterward , stupid me!!!! Anyway my car feels much better, and sounds better with the new glasspack installed in place of the resonator, if any one cares. Oh and I think the inside of the ps resonator is louvered.If Louvered means a bunch of small ridges with holes in them? Instead of just being perforated with no ridges just holes, se-r.net says the louvered style glasspacks cause major backpressure. I wouldn't be surprised if this was on the ps cat-back. I hope my post wasn't to boring.