The StingRay Performance System is designed to get your boat on plane faster, eliminate chinewalking and porpoising, and improve stability and fuel efficiency. The system is based on the Hydrofoil Stabilizer, now made with SPEED-XP, an extreme performance hydrophilic material that increases the speed that can be achieved over previous models. SPEED-XP binds a thin layer of water to the foil, dramatically reducing hydrodynamic drag and improving overall performance. Unlike simple curved or flat planing aids, the StingRay actually creates lift, improving cornering ability. The StingRays ability to get on plane more quickly not only benefits waterskiers, powerboat racers and others looking for quicker acceleration, it also improves safety by keeping the bow down and improving your field of vision. StingRay is easy to install and includes all necessary hardware; the XRIII features no-drill installation. Put your boat on plane faster, eliminate chinewalking and porpoising and improve stability Reduce hydrodynamic drag and improve fuel efficiency and overall performance Easy installation, hardware included StingRay Jr. is for smaller engines (from 1 1/2-40hp) StingRay Torque Equalizers minimize steering torque, improving boat control