So im trying to slap on a magnaflow muffler sometime this week. i talked to a guy at a local performance shop and he told me he wouldnt have to change the piping stating that the stock 07 tahoe piping is already 3.25in. is that true? also, i want the mean rumbling sound, will the diameter of the piping play a role in that? and lastly, if i take the resonater off, will it be too loud? any advice would be great. thx guys!