Trying to find SLE cat size - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 10-15-2007, 02:25 AM   #1
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Default Trying to find SLE cat size

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?
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Old 10-15-2007, 08:20 AM   #2
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Yours should be 2.25" I don't think we've actually seen anyone with 2.50" on an SLE.
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Old 10-15-2007, 01:18 PM   #3
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Well then I will just order that. I wonder why the hell I couldn't find anything decent for measurement remotely within that number.
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Old 10-15-2007, 01:24 PM   #4
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Seems to me as though the ID is 2.5" on the cat, then it necks down to 2.25" ID at the resonator.
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Old 10-15-2007, 01:59 PM   #5
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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.
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Old 10-15-2007, 02:06 PM   #6
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My exhaust place cut the cat off the flange and welded a bead about to make it happen. Dunno it that helps.
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Old 10-15-2007, 02:07 PM   #7
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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.
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Old 10-15-2007, 02:07 PM   #8
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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

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Old 10-15-2007, 04:49 PM   #9
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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.
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Old 10-15-2007, 05:15 PM   #10
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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.
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