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ALL states require cats, but if they don't inspect, you can run without them. As far as mils go, they work fine, I haven't heard any complaints about them wearing out, but the best option is a tuner like sct or predator that allows you to turn off the rear O2's, all they do is monitor cat efficiency, and since without cats the cat efficiency is 0 they will throw the cel. The fronts are the only ones that matter and are unaffected by mils or turning off the rear sensors.
 
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