Well, you need a L8 ECU (saph4x4), the right MSD closed loop chip for your conversion and a lambda sensor. Other parts will remain the same as you already have put in. (like for instant greens or greys, 3 bar mapsensor etc.)
And it sooooo easy to setup. The software does almost everything for you. And you'll get a clear manual with the chip from MSD, it all speaks for itself.
what sort of figure is it to get this done?