It does, but it's worth noting that a manufacturer of such devices can make it meet federal emissions regulations (if they want to spend the $$$$ on R&D), and t

It does, but it's worth noting that a manufacturer of such devices can make it meet federal emissions regulations (if they want to spend the $$$$ on R&D), and they can sell devices that are 100% legal in all 50 states. Examples are Green Diesel Engineering (Who did a TON of dyno time and used to work for a major OEM on emissions stuff) and Banks (who are virtually an OEM at this point)