70-2021 amplifier integration bypass harness to do with the factory amplifier enhance audio quality. To fix speaker blown and no audio at all (or very low) issues. This harness bypasses amp and creates a loop to avoid more distortion than usual over time. Not compatible with aftermarket.amp systems like Bose, Infinity, etc. | The factory amp bypass Jumper harness work the purpose is to adding an aftermarket Amplifier and replacement subwoofer. | Factory amplifier harness jumper wire cable replacement for Chevy Monte Carlo 2000-2005, Avalanche 2002-2006, Impala 2000-2005, Tahoe 2003-2006, Suburban 2004-2006, Silverado 2007 Classic Models ONLY, Silverado 2004,2006, SSR 2003-2006, Cavalier 2000-2005, Colorado 2004-2012, Malibu 2004-2005 Classic Models ONLY, Malibu 2000-2003, Trailblazer 2002-2009, Uplander 2005-2008, Venture Van 2000-2005, Blazer 2002-2005, Corvette 2007-2009. | Compatible with GMC Yukon / Yukon XL 2003-2006, GMC Sierra 2003-2007, GMC Canyon 2004-2012, GMC Envoy 2002-2009, GMC Savana 2003-2007 Full Size Van RED WOLF. | Plug and play. No rewire is required when installing new radio and removing factory amp. By attaching it to the end of the trunk harness that previously plugged into the amplifier, you are bypassing the amplifier, letting the radio directly drive the car speakers.