Unless you've got a DFI engine, then's it's not that easy. To do the wiring is of moderate difficulty, like for non-DFI, but the tuning is the hard part for DFI (GDI). I doubt that Haltech has any DFI-capable ECUs right now. Motec, Bosch & Pectel (Cosworth) can do DFI and it sounds like a couple...