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I unfortunately am not a catalytic converter expert. If you are going to use a catalytic converter on a modified ZL1 making any sort of power, I would be paying top dollar (GESI 85500 or GESI 85600) to have a huge factor of safety on horsepower ratings. It is worth the initial investment to product your engine now rather than buy an engine later.
A factory C7 ZR1 will blow out OEM cats on track with an OEM tune to put it into perspective.
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