Big Gun 09-14 Yamaha YFZ 450R/450X Power Box

This is the Big Gun TFI (Throttle and Fuel Injection) Power Box, designed specifically for the 2009-2014 Yamaha YFZ 450R and 450X models. If you've added an aftermarket exhaust to your fuel-injected ATV, this module is a highly recommended addition to help your engine perform at its best. It works by optimizing your throttle mapping and fuel delivery, making noticeable changes to how your machine runs.

What this box does is sharpen up your throttle response, so when you twist the grip, you get a quicker reaction. It also smooths out the power delivery across the board, with a particular enhancement in mid-range torque. This means you'll feel a stronger pull when you need it most, like coming out of a corner or climbing a hill. The unit is built with durability in mind, featuring rugged construction and weather-resistant sealing to handle the tough conditions these ATVs often face. Plus, it's a plug-and-play installation, meaning it connects directly into your existing EFI system without interfering with the stock ECU map, and you don't need a computer to make adjustments.

Adjusting the settings is straightforward thanks to integrated faceplate buttons, so you can fine-tune the EFI on the fly. This third-generation technology installs in minutes and is designed to increase horsepower and throttle response without sacrificing the reliability of your YFZ 450R or 450X.