I got my dr. gas o/r x pipe installed today. The mechanic said he had to modify it a little bit to make it fit, he said it was a half inch short on one side. Okay so here is what i think. Sounds a little louder than stock up to 3500 rpm. Once you hit 4k all hell breaks loose in a ear piercing roar. sounds awesome really loud with magnapacks.. NOticed some lose under 3500, but big gains from 4k to redline.. Good mod!!!