Description:ABOUT AMPPRO SUB FOR GMIntegration with today’s advanced vehicle systems like databus-controlled amplifiers can be difficult, if not impossible. AmpPRO SUB products seamlessly integrate with the databus allowing for full control and optimum sound from a factory radio when adding aftermarket amplifiers.FEATURES Upgrade solution for factory, fixed level, data-bus controlled sound systems Time-saving design prevents the need for audio correction devices Retains OnStar, Bluetooth, navigation, safety systems, and all warning chimes Subwoofer preamp output (5 volt RMS) Provides flat-low frequency audio output Customized OE bass center frequency selection Plug-n-play installation Remote sub level controller included INCLUDES Amplifier Installation Adapter Vehicle Specific Harness ANC Bypass Harness Flush Mount Sub Level Controller