I read, on this forum I think that police can issue one of these if the see you drive past and think "hmm, that's loud". However the guy at the EPA I just spoke to says the notice may have been issued to the previous owner. Im pretty sure the car is legal, its not as loud as my AC Cobra replica and that is legal. The guy at the EPA was decent though. Before I could ask he said he would try and get me an extension as it was short notice and nearly Xmas etc.