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Big Gun TFI Power Box for 2010-14 Polaris Sportsman 550 Models - 40-R54J 2008 Yamaha YXR700FDU Rhino Ducks Unlimited Edition 1999-01 Ski-Doo Mach ZBig Gun Exhaust TFI Power Box Increases horsepower and throttle response Installs in minutes Third generation technology No computer needed to adjust EFI Plug in technology (Does not interfere with stock ECU map) Integrated faceplate buttons provide easy adjustment Highly recommended for any EFI unit with aftermarket exhaust 1 Year Limited Warranty When installing an aftermarket exhaust, proper tuning is a must. The Big Gun Power Box is a plug and