Excessive display of horsepower as in the backfire from the exhaust when he shifted gears. That is the only downside to removing cats, in that it makes ur car more likely to backfire and shoot fireballs. You don't need a 800hp car to qualify for the charge. If you redline a car for no reason whatsoever just pulling away from a light, then that could be excessive display of horsepower. Burnouts may qualify also, but I think that is a separate charge. Either way, get a lawyer, and you should be able to get all the equipment violation charges dropped or maybe lessened in severity.