This Harness type is a Male Cigarette Lighter Connector attached to an SAE Connector. This is for use with some vehicles such as Porsches that can be charged through their Cig Lighter Port in the vehicle.
Things that could pair well together with what you are looking at...
Messaged Brian about the thought of doing coilovers and sway bars on my c6. He called me up and we talked for probably 30 min, awesome guy to work with/shop with. Definitely would recommend this company.