Big Gun 15-19 Polaris RZR 900/TRAIL/900S/RZR 4 900 Power Box

If you've got a 2015-2019 Polaris RZR 900, RZR TRAIL, RZR 900S, or RZR 4 900 and you're looking to get a bit more out of your engine, this TFI Power Box from Big Gun is a solid option. It works by fine-tuning how your throttle input translates to fuel delivery, making the whole system work together more efficiently. This means you'll notice a sharper throttle response and a nice bump in mid-range torque, which is really helpful when you're out on the trail.

What's great about this unit is that it's designed to be a plug-and-play module. You don't need to be a computer whiz to set it up; it has integrated buttons right on the faceplate for easy adjustments, and you don't need a separate computer to tune your EFI. It's built tough, too, with rugged construction and weather-resistant sealing, so it can handle the rough conditions your RZR is likely to face. Big Gun is known for their powersports exhausts, and this power box is often recommended when you've upgraded your exhaust system to get the most out of those modifications.

Installation is straightforward and usually takes just a few minutes. While it's designed to work with your stock ECU map without interfering, it's important to note that this unit is not CARB approved and cannot be shipped to California.