1/4 diameter smaller on cat - 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 12-12-2007, 12:22 PM   #1
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Default 1/4 diameter smaller on cat

I was going to change out my muffler with a 2.5 magnaflow muffler and I noticed that my cat is 2.25, but the rest of my exhaust is 2.5. This the first time I got underneath the car to tamper with the exhaust. My question is, is this hurting flow/performance of the vehicle?
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Old 12-12-2007, 12:58 PM   #2
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I'm assuming on your L27? No, it'* not hurting at all. Going larger might hurt.
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