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I totally understand that exhaust is always one of the first steps in freeing up horsepower. My first requisite however is that the car will pass smog, so for the purposes of this discussion we need to get by the SMOG issue. I think putting on cats would cause more than a half second Quarter Mile time difference on Greg's car. I could be wrong, but I would imagine the airflow bottleneck that would result from putting on cats would have a more significant negative impact...
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