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Big Gun TFI Power Box for 2009-13 Arctic Cat 1000 models - 40-R50A 2012 Polaris Sportsman 500 1979-81 Honda CX500D DeluxeBig 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