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99 Z28 catalytic converter question

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Old May 1, 2008 | 08:58 AM
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squale iii's Avatar
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Default 99 Z28 catalytic converter question

If I have the catalytic converter removed and just weld a straight pipe in it's place...will that free up any power? And will it throw any check engine lights on? Thanks.
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Old May 1, 2008 | 10:15 AM
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Yea it will free up power. Shouldnt throw any codes if you have rear o2 deletes. Then you can sell me your cats
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Old May 1, 2008 | 10:53 AM
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the rear o2 sensors will throw a code, but they have no affect on performance of the engine. it's just the light.

probably only see 2-3hp from the cat delete.
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Old May 1, 2008 | 11:24 AM
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Right but if he has the rear o2 sims he will be fine. No light or anything
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Old May 1, 2008 | 08:19 PM
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How much HP will he gain by removing cats?
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Old May 1, 2008 | 09:33 PM
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Originally Posted by teke184
probably only see 2-3hp from the cat delete.

the manifolds are the big restriction. the cats aren't bad, and neither are the "flattened" exhaust pipes on the Y
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