For a 2000 xj what size Inlet/Oulet do I need for a new flowmaster 40series muffler

So I put a hole in my muffler I need to replace it with a new one someone suggested a flowmaster series 40 I just don't know what size inlet outlet I need. I have been reading 2.5 2.5 but then I'm also reading 2.25 2.25 I don't know what is correct also do I need centered or offset? Thank you

Tech really needs to go in the tech forum.

I searched "muffler inlet size"

http://naxja.org/forum/showthread.php?t=1032798&highlight=muffler+inlet+size

a tape measure works pretty well too.

stock is 2 1/4 (2.25) inlet and outlet and it is a center in offset out

Summit Racing Part Number:FLO-942442 (delta flow 40 series)