40 CFR 91.701 - Applicability.
(a) Except where otherwise indicated, this subpart is applicable to marine SI engines for which the Administrator has promulgated regulations under this part prescribing emission standards, including engines incorporated into marine vessels or equipment, that are offered for importation or imported into the United States, but which engines, at the time of importation or being offered for importation are not covered by certificates of conformity issued under section 213 and section 206(a) of the Clean Air Act as amended (that is, which are nonconforming marine engines as defined in § 91.702), and this part. Compliance with regulations under this subpart does not relieve any person or entity from compliance with other applicable provisions of the Clean Air Act.
(b) Regulations prescribing further procedures for the importation of marine SI engines and marine vessels or equipment into the customs territory of the United States, as defined in 19 U.S.C. 1202, are set forth in U.S. Customs Service regulations.