Weird, that's the part number for the stock cat. I measured it and it has a 2.5" diameter opening and 4.25" between the bolt holes. What size cat did you get? Justin McClanahan Quoting Briancembor@aol.com: > okay, i went and looked at that part at nissan w/ my cat. > the opening is not the right size and the flange and > gasket do not sit flush.