Big Gun TFI Power Box for Polaris Sportsman 850 models - 40-R54G

Regular price $261.39

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Big Gun Exhaust TFI Power Box

Part Number: 40-R54G

  • 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-play fuel controller that allows you to properly tune your fuel-injected motorcycle, ATV or Side x Side in just minutes. Installing a Power Box allows you to get the most out of your aftermarket exhaust and increases throttle response. A Power Box helps cure the lean issue that is run into when installing a higher-flowing exhaust and comes pre-programmed with a middle-of-the-road setting already into it, making it easy to install and go ride.


  • This product is not ARB / CARB compliant and cannot be sold in the state of California
  • Image(s) shown may not represent the actual product sold for this vehicle, See "Fits" section for application indications (part shipped will fit applications indicated in the description)