an emissions test won't show the real effects of EOC unless it were hooked up to a dyno that could simulate road friction and inertia of the vehicle, so that you could shut it down while at speed, let the vehicle "slow", then fire it back up to get back to your target speed. then the emissions readings immediately after firing would be useful to look at.
it SHOULD NOT effect cat life(or effectiveness, when it is in it's designed operational scenario) much, if at all.
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