This article shall not apply to an alteration, modification, or modifying device, apparatus, or mechanism found by resolution of the State Air Resources Board either:
(a) To not reduce the effectiveness of any required off-highway motor vehicle pollution control device; or
(b) To result in emissions from any such modified or altered off-highway vehicle which are at levels which comply with existing state or federal standards for that model year of the vehicle being modified or converted.
(Added by Stats. 1976, Ch. 1093.)