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Get an off-road H-pipe, then your cat problems will be solved. But if that is not what you want, then I will try and help you. It will be running really rough, and your exhaust coming out of your tail pipe/turn down, whatever you have, will not have much pressure to it.
 

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not so sure about the emissions thing. Oh, and my father said that one way to check it is when the motor has been running for a while, look and see if the cat is glowing red, because if it is, that means that all the exhaust is getting backed up there.
 
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