Originally Posted by PimestiLL
this is not true i happen to work at a muffler shop i'd say to go with 2 1/4 catback welded in custom bent with a Tubemaster custom pipe bender.... i've always had great results i do ruffly 10 integra's a week...
You took what I said out of context.
Yes, a 2.25" ID exhaust will increase exhaust flow, but the original poster has expressed no interest in a cat-back exhaust.
Re-read his initial post. From what I can see, it would appear that he is only replacing the rear muffler with what I assume is an identical part..