C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

catalytic converter help

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Old Jul 3, 2009 | 06:02 PM
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Default catalytic converter help

Need help understanding my converter system. 87 coupe. I know there is the man converter, but are there also two on the y pipe? I think my main one is broken apart. Should all three be replaced at the same time?
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Old Jul 3, 2009 | 07:12 PM
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The ones on the Y pipe are pre-cats to replace then you need to buy a new pipe. The main cat can be replaced on it's own. if the pre cats are ok leave them unless you feel like spending the extra money.
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Old Jul 3, 2009 | 07:34 PM
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Originally Posted by floridamale
The ones on the Y pipe are pre-cats to replace then you need to buy a new pipe. The main cat can be replaced on it's own. if the pre cats are ok leave them unless you feel like spending the extra money.
How do you tell if the pre-cats are bad?
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Old Jul 3, 2009 | 08:04 PM
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Originally Posted by guido7834
How do you tell if the pre-cats are bad?


They tend to rattle and knock when they break apart. It can make you think its a motor knock.
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Old Jul 3, 2009 | 09:15 PM
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If you don't need to pass a smog test, buy a Y pipe without the precats.
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