first i had a 3" staight pipe and it sounded pretty good. went to stock dp and 4" staight pip sounded better, then went to htt 62/13/17 4" down pipe and 4" straight pipe. then went to 5" straight pipe, and then 5" a 7" single miter stack. the stack is the loudest by far, but for the straight pipe i personally thought the 4" sounded better

 

well i would change the pipe size but i have a custom made stack system and my stock pipe is welded in so thats out of the question. So i dont know

 

Its not out of the question just cut it off when you get new set of 5inch exhaust piping and re-route it if need be

 

4in DP TO A 6in single stack.... open the back window and its nothing short of someone screaming in your ear