High-Flow Cats

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May 14, 2007 | 06:49 PM

riddick1224

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From: Texas

High-Flow Cats

I have a '03 Chevy 5.3L and I am looking to get rid of my stock cats. Should I gut them or get some High-Flow Cats. And which ones would ya'll get.

May 14, 2007 | 06:57 PM

KevinF56

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from what i've heard, the stock cats flow pretty good. if you don't need new cats, i wouldn't switch them out for high flow cats. the gains you'd see would be minimal compared to the money you'd be spending.

May 14, 2007 | 06:57 PM

TurboBerserker

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Spun metallic magnaflows. I think I used 59959 (which is the center/center 3" variety) -- and only for inspections after I move

May 14, 2007 | 08:25 PM

5.3LGMC

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Any gain from going to no cats from stock cats? do you loose bottom?

May 14, 2007 | 08:58 PM

user 108208932024

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I didn't notice a diffrence one way or the other, the idle does sound significantly better though with the stock muffler which I have.

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