yeah you have to get it engineer'd and cert'd but technically it is ok as the rule does state based on factory output and you car would be well under. it just happens that now it makes more power, but the rule is flywheel power not rear wheel power as well, so they would only know if they engine dyno'd your engine, which of course they wouldnt. but yeah they will find some way to make u revert it, or send u to the epa, which it will then fail as its a gtst now etc...