Which 20g are you getting? Your FMIC will need the piping of course. You have to send DSMlink the ECU, so you know. With that big of injectors, you might invest in a FPR and have yourself a complete big fuel system. Maybe even go with the HP pump, your choice. It could be argued that even the 255 non HP needs a FPR.
There will be a few little things, like a dump tube to route the Tial wastegate down. Couplers for the FMIC piping, which I can't list for you to prepare for. You'll find out.. start collecting parts