up it to a 5 inch exhaust, it will be a more deeper note but louder. or go 6-7 inch stacks.
i drove around like that for a day when we were doing my exhaust. the drone between 1500 and 2000 rpm rattled my rearview mirror so bad you couldnt see out of it. :shock:run the down pipe, and have it shoot straight to the ground. the noise will reverberate off the ground and your truck. will shake building foundations.
4 and 5 i throw in the same category (my mistake)...4" is a little raspier and 5" is just deep...i just dont know why someone would want anything louder than that:confused013:4" aint all that loud, had one wasnt really inpressed with it. Run a 5" pipe with a 6" tip, now thats loud and sounds good to.