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from what i understand, the power restriction is the least of the cats concern. they tend to fail and cause serious engine damage from the research i have done on it. i put a set of headers on mine before i ever put the finished engine in the car. however take care in insulating them or the alternator very well. my headers sit under a 1/2 inch away from the alternator and it may be the extensive head work and therefore increased header temperature has twice now cooked out the circuits in my alternator. if your going to do ANYTHING to it id suggest starting there good luck and enjoyReport it
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