The Metra 70-5522 is a subwoofer integration harness designed specifically for select Ford, Lincoln, and Mercury vehicles from 2003–2013 equipped with a factory subwoofer system. This harness allows installers to retain the factory subwoofer when upgrading to an aftermarket radio, helping preserve low-frequency performance while simplifying the installation process. Constructed with high-quality automotive-grade wiring and OEM-style connectors, the 70-5522 provides secure and reliable connections between the aftermarket head unit and the factory subwoofer system. Designed for plug-and-play installation, it eliminates the need to cut factory wiring and helps maintain the integrity of the vehicle's electrical system. Features: Fits select Ford vehicles from 2003–2013 Fits select Lincoln vehicles from 2003–2013 Fits select Mercury vehicles from 2003–2013 Subwoofer integration harness Retains factory subwoofer during aftermarket radio installation Plug-and-play installation No factory wire cutting required Maintains factory wiring integrity OEM-style connectors for secure fitment High-quality automotive-grade wiring Reliable low-frequency audio signal connections Simplifies aftermarket radio installation Preserves factory subwoofer performance Color-coded wires for easy identification Designed for secure and dependable electrical connections Ideal for professional and DIY installations Helps reduce installation time and wiring complexity Compatible with most aftermarket head units when used with the proper installation components Perfect for retaining factory bass performance while upgrading to modern multimedia receivers and audio systems