Section 1045.660 - How do I certify outboard or personal watercraft engines for use in jet boats?(a) This section describes how to certify outboard or personal watercraft engines for use in jet boats. To be certified under this section, the jet boat engines must be identical in all physical respects to the corresponding outboard or personal watercraft engines, but may differ slightly with respect to engine calibrations.(b) The outboard or personal watercraft engines must meet all the applicable requirements for outboard or personal watercraft engines. Jet boat engines certified under this section must meet all the applicable requirements for sterndrive/inboard engines.(c) The jet boat engines must be in an engine family separate from the corresponding outboard or personal watercraft engines.(d) Jet boat engine families may use emission credits from outboard or personal watercraft engine families, as described in § 1045.701(d) .(e) Jet-boat engines certified under the provisions of this section must meet emission standards over the same useful-life period that applies to the corresponding outboard or personal watercraft engine family, as described in § 1045.103(e) .