I have a v6 with a terrible exhaust basically i have clogged catalytic converter a exhaust leak and the muffler is basically falling apart lol. so I am going to get it replaced but i want it to sound good a guy quoted me 400 hundred for a new everything but i don't know what size piping he will use. anyway i don't know what size the factory exhaust is but i was thinking of three inch but my friend was revving his bone stock engine at school one day and it sounded so good it was deep and loud. i was just wondering should i get 3 inch exhaust or 4 inch exhaust and if theres much of a difference and is one more expensive than the other any suggestions would be great Thanks