Just about to that point now that i got to start figuring that one out. My current plan is to run the factorie style "Y" pipe and then do singel 3" after that with just a glasspack, but have it run all the way out the back. Does this sound like a good idea? the truck allready is set up for duals (has dual 2 1/4" till the muflers which are both blown up and missing tailpipes) but then id basicly have to buy twice the exaust parts to keep it dual. So what would you do?