Well right now, we sell a harness for $600, all the factory stuff is free with your magnum purchase and a 300 hp build will run on factory pcm flash so you only need fuel pump/tank/lines which we sell tank w pump for $500 and fuel line kit can be as cheap as $150. Not too bad considering my competition sells harness for $1000 or more and that doesnt come with free tech support like ours does.