yea, dumping them will make them louder because of the resonation. Im thinking about dumping my pipes. But then it may be too loud. its not really load in the cab at all with the side pipes. Atleast not to me.drakesdad said:Eric.....that was the first thing I did to mine was remove the stock mufflers and ran straight pipe...I like the way it sounded driving but when you rev it it popped too much for me...I removed the cats for the H pipe and put dumped 40 series on at the same time.......I actually think the flows dumped are louder.........or at least sound that way in the "cabin"..........maybe just the resonation sounds......![]()