darksnake Posted May 13, 2012 Report Share Posted May 13, 2012 On our GT500's, which item has more exhaust flow restriction, stock cats or mufflers?? My '08 is Dyno Jet dynoed at 600 rwhp, 625 rwtorque, w/16.5# boost @ 700 engine hp. I have the new MRT Hi-flow H-pipe (reduced cats) with Corsa Sport Mufflers (straight thru). But, too loud for normal use, crusing, and hearing my music:} Option 1: Stay with MRT H-pipe & stock mufflers (quieter, louder & lower tone then stock). Option 2: Stock H-pipe & cats with Corsa's (louder then option 1, sounds great, may be more restictive?). If I stay with MRT Hi-flow H-pipe, any suggestions on a quieter, baffled performance muffler? Link to comment Share on other sites More sharing options...
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