Professional Racing Outboard (PRO) is one of the most diverse categories in the American Power Boat Association. These light weight speed demons tend to really get the crowd going and will wake up any person sleeping within a mile of the race course. The 19 PRO categories are easily the loudest of the APBA Outboard categories. Known for having the largest power boat racing class in the world (OSY 400), PRO races never disappoint. The PRO category tends to lend itself fore towards the gearheads who have a mechanical inclination and the ability to modify their motors. PRO drivers are some of the most dedicated racers around but will happily open up their trailers and help a new racer who wants to get behind the wheel.