Sometimes raced by Formula 1 teams, the Mod U (Modified Unlimited) class is where raw horsepower is king and anything goes. When these boats explode off the dock with an unforgettable roar, fans go crazy. Mod U racecraft are lightning-fast on the straightway and take the turns at top speed. Any boat design is permissible; engine modifications are just fine. Mod Us are raced mostly in the Southeast, and at the OPC National Championships every year.

