Horsepower Loss Through High-Flow Cats?

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Apr 26, 2004 | 08:35 AM

Josh

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Horsepower Loss Through High-Flow Cats?

How much horsepower would you all imagine I'm losing through my 3" CarSound high-flow cats? Has anyone ever dynoed with high-flow cats and then with an ORY and taken note of the gains?

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Josh

Apr 26, 2004 | 11:37 AM

99-LS1-SS

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From what everyone told me I would say between 4 and 8 rwhp will be lost.

Apr 26, 2004 | 12:25 PM

jRaskell

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It'll depend on how much power you are making. On a mostly stock engine, you're looking at about 4-8hp. On a heads/cam/all bolt-ons engine, there could be a much bigger difference, upwards of 12-15hp lost through the cats (the engine overall is pushing much more air through, so the cats are going to become an even greater restriction. Any given restriction is going to become more and more significant as other restrictions are removed or opened up.