Yamaha OEM OEM Wolverine RMAX 1000/X4 850 8" Powered Sub Woofer by SSV Works B4J-H81S0-V0-00 FITS: B4J-H81S0-V0-00 WOLVERINE RMAX4 1000(2021) WOLVERINE X4 850(2021, 2020, 2019, 2018) Nothing makes audio sound better than a Powered Subwoofer. This 8” Subwoofer is custom built to fit under the seat and is completely sealed and waterproof. With 200 watts of power, your friends will feel and hear you coming down the trail. 200 watt amp Custom designed 8” sub with SMC sub enclosure Mounting location under driver’s seat to maintain cargo space Prewiring included for all models equipped with factory audio system Compatible with Heater Kit and Second Battery Kit