Developed for: 2007 & newer GMC Sierra Extended Cab
PowerStage™ Upgrade includes SubStage Upgrade plus multi-channel DSP amplifier for factory speakers, wiring kit and mounting brackets.
*Powered subwoofer is not compatible with a 2007 Classic (2006 Body Style). Subwoofer is not compatible with trucks that have a solid rear bench style seat without modifications and additional parts (not supplied). Please contact Technical Support for the additional information. Multi-channel amplifier is not compatible with vehicles that have Bose factory premium audio systems. Multi-channel amplifier is not compatible with vehicles that have adjustable pedals.