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Big Gun TFI Power Box Honda TRX420 Rancher / TRX500FM1 Foreman 2014-2022

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This product is legal in California only for racing vehicles which may never be used, registered or licensed for use upon a highway.

Big Gun TFI Power Box Honda TRX420 Rancher / TRX500FM1 Foreman

Any aftermarket exhaust allows an increased amount of airflow through your engine by reducing restriction. Big Gun offers this plug-and-play TFI Power Box fuel controller to correctly tune your machine after installing one of their exhausts, adding more fuel to maintain good ratios throughout the rpm range. Protecting your engine from running lean helps keep temperatures down and helps maintain smooth stock-like drivability. Integrated faceplate buttons allow for easy adjustments without the use of an external device.


  • Increases horsepower and throttle response
  • Includes pre-set map to compensate for Big Gun exhausts
  • Plug-and-play harnesses plug directly in line with your stock fuel injector harnesses using factory-style terminals
  • No extra computer, phone or tablet required to make adjustments
  • Installs in minutes
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This product is vehicle specific. Click here to select your vehicle to ensure fitment.

This Product Fits:

Foreman 500 4x4 TRX500FM1 2014-2019
Rancher 420 2x4 ES TRX420TE1 2014-2022
Rancher 420 2x4 TRX420TM1 2014-2022
Rancher 420 AT DCT TRX420FA1 2014, 2015, 2016
Rancher 420 AT DCT w/EPS TRX420FA2 2014-2022
Rancher 420 ES TRX420FE1 2014-2022
Rancher 420 TRX420FM1 2014-2022
Rancher 420 w/EPS TRX420FM2 2014-2022
Product Style Item # Store SKU Manufacturer Product # Availability
Product Style Big Gun TFI Power Box Honda TRX420 Rancher / TRX500FM1 Foreman 2014-2022 Item # 10210019 Store SKU Manufacturer Product # 40-R52C Availability In Stock: Ships in 1-2 business days
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