iv had mine out for a couple weeks now and wow. it is alot louder, almost to much when towing. with the windows up and cruzing down the highway its louder than the exhaust, and that pulling 26k. i have not noticed any loss in power at all.
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07.5, 6.7L,2500 quad cab 4x4,6spd auto,s&b intake,edge juice/att "hot",ts mp-8, air dog 150, code free dpf/egr/egr cooler delete, leveled with 285/70/17 bfg km2's,10k H.I.D's,ride rite air bags, 3rd tranny is 6k.