I always thought my straight pipe sounded pretty bada$$, but now that I have my full 4" exhaust with flow thru muffler, I have to admit, the truck does sound even better.
Plus, I didnt realize how much DRONE was in the cab until the new muffler went on. The truck wasnt any LOUDER inside, but something about the straight pipe gave the cab a slight hum that is now gone with the flow thru muffler.
Can still here the whistle tho, and thats all thats important.