Finially an elegant solution for running the 4.6 / 5.4 engines in classic Mustangs, street rods, race cars - whatever you want! Our SDS fully programmable system comes with a harness and plugs that allows you to adapt it to the stock 4.6/5.4 engine harness at the firewall. Easy, clean wiring with no stock chassis harness to tear apart. The SDS is a true standalone system and allows full control of all fuel and timing. No mass air meter required, comes complete with map sensor for natually aspirated or forced induction engines.