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Big Gun TFI Power Box for 2005-09 Polaris Ranger XP 700 Models - 40-R54D 1984 Suzuki GS1100G 1990-93 Polaris Trail Boss 2X4Big 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