58 Pa. Code § 119.4
A person may not manufacture, sell or offer for sale a motorboat which is not equipped with a muffler or muffler system in good and constant working condition or which does not otherwise comply with this chapter. This chapter does not apply to power vessels designed, manufactured and sold for the sole purpose of competing in racing events and for no other purpose. An exemption or exception shall be so documented in every sales agreement and shall be formally acknowledged by signature on the part of both the buyer and seller. Copies of the agreement shall be kept by both parties. A copy shall also be kept onboard or be available when the boat is being operated. A motorboat sold under this exemption may only be operated on the waters of this Commonwealth in accordance with § 119.7 (relating to race boats).
58 Pa. Code § 119.4