Sorry, it was cheating.
"Section 203 (a)(3)(b) of the Clean Air Act (CAA), 42 U.S.C. Sec. 7522(a)(3)(b), prohibits the manufacture, selling, or installation of any device that bypasses, defeats, or renders inoperative a required element of the vehicle’s emissions control system. Section 203 (a)(1) of the same Act also prohibits the sale of motor vehicles or engines that are not covered by valid certificates of conformity. 40 CFR Part 86, Subpart A describes the regulatory requirements for defeat devices."