Reprogrammed ECU to allow up to 8750 RPMs. R&Ds OS-91 upgraded ignition timing safe for all recreational and offshore racing use using 91-93-95 octane pump gasoline or Aviation Fuel (100LL). R&D OS-91 works great with stock engine components, stock supercharger system, and R&D Solas 14/21 impellor. The R&D OS-91 program will add snappier throttle response, increased acceleration, and improved top speed performance. The R&D OS- 91 program file does not require a Powershot Fuel Tuner.
