Nope, only epa registered emissions affecting stuff is verboten. But even that seems unenforced, as you can find ecu tuners and piggybacks everywhere. I have pe

Nope, only epa registered emissions affecting stuff is verboten. But even that seems unenforced, as you can find ecu tuners and piggybacks everywhere. I have personally tuned my older cars to have better emissions, so its not only for racers and the environmentally unconcerned. Tldr; I drive a fleet of hacked cars on the road daily. Its fine.