Diagram sent to you stated:
- Quadralock harness install behind radio/iDrive
- 9-wire extension cable is the radio/iDrive output. Wires assignment is printed on each.
- 8-wire extension cable is the OEM speakers input.
- black cables with Molex connectors are the woofer cables
- short jumpers are the woofer connector jumpers
- modified OEM MOST connector is to replace the OEM MOST in your Quadralock in case that it does not lock up into the harness Quadralock
All this require DIYer experience or professional install. Ordering of the Stereo harness does not include install support of any aftermarket equipment. Support is only limited to problems or/and warranty with the harness itself.