; (2) provide that evidence of physical attributes of a vehicle to be used solely for competition may be sufficient to qualify for the exemption under the amendment made by section 3(a); and (3) provide that a manufacturer, seller, or installer of a part or component seeking to use the exemption under the amendment made by section 3(a) may not rely solely on unsupported declarations from the purchaser or owner of a vehicle about— (A) the legal status of the vehicle; or (B) the intended use of— (i) the part or component; or (ii) the vehicle. 5. Effective date Section 3, including the amendment made by section 3(a), takes effect on the date of enactment of this Act, without regard to whether a final regulation has been promulgated under section 4.