Big Gun Exhaust TFI Power Box 40-R57F for Yamaha ATV and UTV

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
Expertly crafted from premium materials
Quality design and workmanship
Durable construction for long service


TFI Power Box by Big Gun®. This top-grade product is expertly made in compliance with stringent industry standards to offer a fusion of a well-balanced design and high level of craftsmanship. Manufactured from industry-leading materials using up-to-date equipment, it ensures everlasting reliability and enduring value. This product is distinguished by total quality assurance, unsurpassed by anybody else.

The Big Gun Exhaust TFI Power Box 40-R57F is an electronic fuel-management accessory designed for select Yamaha ATV and UTV applications. It is intended to work with compatible fuel-injected vehicles and can help provide a more adaptable tuning solution when supporting modifications such as an aftermarket exhaust or other intake and engine upgrades. This product is a practical choice for riders seeking a vehicle-specific performance accessory from Big Gun Exhaust.
The TFI Power Box is designed to provide adjustable fuel-control functionality, allowing the vehicle’s fuel settings to be tailored to its setup and riding conditions. Proper tuning can help support consistent throttle response and drivability when changes to the exhaust or intake system affect the engine’s air and fuel requirements. Results depend on the vehicle, existing modifications, operating conditions, and final calibration.
Built for powersports use, the Big Gun Exhaust TFI Power Box offers a compact electronic solution for Yamaha ATV and UTV owners. Its vehicle-focused design helps integrate fuel adjustment into a performance upgrade plan without replacing the factory engine-control system. Before purchasing or installing, verify compatibility with the exact Yamaha model, year, engine configuration, exhaust system, and intake components. Installation should follow the manufacturer’s instructions, and professional setup is recommended when fuel-system adjustments or additional performance modifications are involved.
The Big Gun Exhaust TFI Power Box 40-R57F is supplied as an electronic tuning component for compatible Yamaha applications. Use the part number when confirming