Big Gun Exhaust TFI Power Box EFI Tuner - 40-R54I Dirt Bike Mufflers & Systems 2018-2019 Yamaha YXF850 Wolverine X4

2018-2019 Yamaha YXF850 Wolverine X4

60" bolt pattern)

High-temp black thermal coated oval shaped aluminum muffler

Lithium Polymer Battery

Powder coated black texture for supreme durability

Big Gun Exhaust TFI Power Box EFI Tuner - 40-R54I Dirt Bike Mufflers & Systems 2018-2019 Yamaha YXF850 Wolverine X4TFI POWER BOX 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