(a) New engines you produce that are used solely for competition are generally excluded from emission standards. See the standard-setting parts for specific provisions where applicable.
(b) If you modify an engine after it has been placed into service in the United States so it will be used solely for competition, it is exempt without request. This exemption applies only to the prohibition in § 1068.101(b)(1) and is valid only as long as the engine is used solely for competition.
(c) If you modify an engine under this exemption, you must destroy the original emission label. If you sell or give one of these engines to someone else, you must tell the new owner in writing that it may be used only for competition.
At 69 FR 39267, June 29, 2004, § 1068.235 was amended by revising paragraph (c), effective Aug. 30, 2004. For the convenience of the user, the revised text is set forth as follows:
(c) If you modify an engine under paragraph (b) of this section, you must destroy the original emission label. If you loan, lease, sell, or give one of these engines to someone else, you must tell the new owner (or operator, if applicable) in writing that it may be used only for competition.