Define "tamper". I personally believe people should be encouraged to modify and improve the performance of their vehicles, so long as those modifications don't

Define "tamper". I personally believe people should be encouraged to modify and improve the performance of their vehicles, so long as those modifications don't prevent the vehicle from meeting the same emissions standards as before. Modding a truck to billow smoke is obviously obnoxious and wrong on more than one level, but the actions of those assholes shouldn't shut down right to repair or car modding culture in general. I have a 24 year old Suburban in need of an engine. Preventing any modification of the ECU, which could be considered "tampering with emissions", would seriously limit my replacement options, and push the vehicle one step closer to a junk yard.