UTV Stereo RZR Pro Series Ride Command Stage 6 Stereo Kit. We are proud to introduce the Polaris RZR® Pro Series Ride Command® Stage 6 Stereo Kit for your Polaris RZR® Pro XP®, Turbo R®, or Pro R® models. This kit was designed to allow you to add an aftermarket amplifier, subwoofer, and speakers to your vehicle utilizing the OEM Speaker enclosures while retaining your OEM steering wheel controls and Ride Command® Screen.