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Originally Posted by Rock_Steady
So basically, when you change your stock pipes as all of us do. The Cat is no longer an issue?
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Replacement of mufflers and a/c requires an adjustment of the AFR through SERT/PowerCommander etc or rejetting on carb models. The cat adds some backpressure and heat, that's it. Oh, you take it out and you are no longer EPA-compliant..........
This is only applicable for engines without the 'closed loop' EFI system. Not sure what is required for this new technology.