Alternative fuels

(a) Aftermarket conversions of motor vehicles to alternative fuel Section 203 of the Clean Air Act (42 U.S.C. 7522) is amended by adding at the end the following: (c) Older vehicles (1) In general The aftermarket conversion of a motor vehicle to alternative fuel operation shall not— (A) be considered tampering under this section if the aftermarket conversion system manufacturer or the person performing the conversion demonstrates that the development and engineering sophistication of the conversion technology is— (i) matched to an appropriate motor vehicle or group of motor vehicles; and (ii) well-designed and installed in accordance with good engineering judgment so that the aftermarket conversion system does not degrade emission performance, as compared to the performance of the motor vehicle or motor vehicles before the conversion; or (B) require the Administrator to issue a certificate of conformity. (2) Label The person performing a conversion described in paragraph (1) shall affix a label to the motor vehicle stating that— (A) the motor vehicle has been equipped with an aftermarket conversion system; and (B) the installation of that system occurred after the initial sale of the motor vehicle. (3) No preclusion of orders Nothing in this subsection precludes the Administrator from issuing an order to prohibit the manufacture, sale, distribution, or installation of an aftermarket conversion system if the Administrator has evidence that the installation of the aftermarket conversion system on a motor vehicle degrades emission performance.. (b) Biomass fuels Section 211 of the Clean Air Act (42 U.S.C. 7545) is amended by adding at the end the following: (w) Biomass fuels Notwithstanding any other provision of this Act, the Administrator may not prohibit or control biomass fuel (as defined in section 203 of the Biomass Energy and Alcohol Fuels Act of 1980 (42 U.S.C. 8802)) under this Act..