3" may be a little big. i run a true dual 2.5" on my 5.2 yj and it flows everything it can plus some. your mufflers will tell the tale over the size of the pipe. i realize your running a single dump. there may be no detriment but i don't believe you will gain any performance from the 3", like i said my .02 is choose a quality performance muffler and keep the pipes at 2.5".
as hesser said... i had the headers, cat, and mufflers already in place, had the shop build me a set of tail pipes, and i walked away with less than a $200 bill to make tailpipes, hangars, and mounts.
Ratmonkey donation page. all proceeds will go to his family.
it's not much to look at... but it's mine.
5.2lswap, metalcloaks, bedliner, tucked belly, d60's, soon to be nv4500 and d300.