What is the stock exhuast pipe size? I'm thinking its around 2 to 2.5", is this true? I'm lookin to put on Flowmaster super 44's or glasspacks and wanting to get new tips and jsut wanna know the size for that aswell.

just under 2.25"

Does that mean if i get a new muffler or glass pack that I should go with 2.25" or 2.5"?

there are adapters you can get to upsize the existing pipes. Of course, you could go and get the 2.5" d/p w/hi-flo cat, custom pipes, and aftermaket muffs, and not hafta deal with venturi tubes or compatibility or stuff.

Short answer: there are adapters out there, weld and bolt. Where? I dunno. I imagine Corey or BlackArrow would know

Iirc the Y pipe is 2"

if you go with a 3"dp, u bend delete, have a shop make you a 2.5" cat back with it. Thats what i did

Get 2.25" offset in--center out mufflers. The out diameter does not matter unless you are going to use the stock tips, then it is also 2.25. The Y-Pipe is 2.5 in and dual 2.25 out.