Naw I have the stock one. It's still installed which is why I'm hopeing to do the cat back system but i'm trying to find out the inlet of that cat. But I guss I'll have a shop take a look.

 

Any shop will be able to tell you what size pipeing it is, or just look around online... Look up a stock replacement and it will tell you the inlet/outlet pipe size...

 

agreed glass pac resenators make a difference and if the shops around there are like they are here in Arkansas they wont think twice about removing or puncturing your cat for you. so i would just ask the worse thing they will say is no.