This is a high-quality, pre-made wire harnesses for the Evo 4-9. It has connectors for Hitachi or NGK (GT-R) coils and connects right up to the stock Evo connectors for use with a Coil-on-Plug ignition system. The wire harness is complete and ready to be installed on your coil-on-plug system. Check out the other listings for a complete setup or individual pieces for your COP system.