When i got the truck it has a SI/DO flowmaster 40 i think, and the cat had been removed. Well it wasnt loud enough so i had the flowmaster cut off and made my exhaust true dual straight pipes. Its stupid loud! Ill take a video later if my camera will pick up the sound good. I dont recomend this to anyone if cops in your town are strict on loud exhuast. It doesnt really have a good sound so i think im gonna run some 24" glasspacks next. Just thought i would share