This is the Pro 440 Superstock that was used by Christy Carlson for the entire 1990-1993 pro racing inventory for 2 IJSBA National and World Championship winning, professionally built jet skis, and complete parts maintenance inventory. These are the boats that were raced, tested, and practiced with. They are not duplicates or replicas! From 1989-1996 Christy Carlson was one of the top Pro Jet Ski Racers, winning 100s of National, World, and International races and titles. Look up the history of Jeff Jacobs and Christy Carlson and you will dig up a deep history of championship winning machines built and maintained by jet ski engines tuned by guru Bill Chapin. The boats and complete racing parts inventory to maintain a fleet of Pro 440 Super stock racing skis are featured under the Tests section.