Vortex ECU 20-22 Yamaha YZ450F 4-StrokeModel Specific Features Improved bottom end Power and throttle response Improved top end and over rev Power Power Ignition & Fuel Mapping Db assist to help meet Sound Regulations Traction Start and Enduro maps for traction and throttle control Higher Rev Limits Advances Fuel Injection Timing for improved atomization and response Dual Injector Capable Muti Function Port for adding, Vortex Map Switch, 2nd Injector or Speed Shifter If required Advanced