so everyone knowS, i do most of work with scott at massdiesel , have to remember that i am cheap , and sometimes alittle thick headed, but i am, man enough to admit to it , scott did say that it was going to be loud and warned me a couple of times but like everyone else we always want to see what will happen , i like the sound of being straight piped but certain rpm's it sounds like crap to me and i was looking for a muffler that would still make it loud but different than everyone else's rig , well i took off the 5"tip last night, cut off about 8" of 4" stock exhaust pipe and i installed a 18" x 6" stainless tip , well i got the sound i was looking for , its loud but it sounds like a big mack dump truck , it really raps when you want it too, SO the point of this story is when your diesel guy gives you advise - take it and think about it awhile because chances are he's already done it , heard about it, or fixed a problem like yours, LISTEN TO YOUR DIESEL GUY ! :-laf :-laf :-laf