So I never realized how HUGE that stock cat is. I just crawled under there and the smallest pipe I measured around the cat was some strange number like 2.65". I don't know where to measure it to know where to order it from. That was the measurement on the pipe on the cat just after the cat. It then got smaller and went inside another pipe that went to the resonator. Where the hell do I measure to determine what aftermarket cat I need?

Yours should be 2.25" I don't think we've actually seen anyone with 2.50" on an SLE.

Well then I will just order that. I wonder why the hell I couldn't find anything decent for measurement remotely within that number.

Seems to me as though the ID is 2.5" on the cat, then it necks down to 2.25" ID at the resonator.

Thing is, I'm not getting the bolt on. So if the outlet on the pipe coming from the manifold is huge, I don't know how they'd fit that. Because it is in fact, huge. lol.

My exhaust place cut the cat off the flange and welded a bead about to make it happen. Dunno it that helps.

Yeah I'm sure that'* what they'll do... I just dont want it to be so big that they have to figure out how to make like a half inch bead lol.

doesnt the front of the cat bolt directly on to the downpipe?

if you got a universal they would have to make a custom flange and everything for you.

I'd suggest this direct bolt on, that you could do yourself in your driveway with a clamp on the back end.

http://hoganperformance.com/CC1.htm

Yes, he has the 4 bolt flange in front of the cat. The place here in town that did Ben'* car cut the flange off and welded the cat straight to the DP(IIRC).... I think they should have cut the flange off the cat, welded the cat to the flange, and tried again.

Yeah I was considering that too. Because If they're going to charge me $70.00 bux in labor (they quoted me $40-$50) for everything having to be custom, f-dat, I could do my own for cheaper and I know it was done right and it'* not going to leak during the winter from a crappy weld.