Ok i have a K04 on mine and still run the OE injectors and a 4 bar FPR. I also still have the SMIC in palce and the map takes account of all that. I am sure i have more power avalilable by swapping the injectors and throwing in a FMIC but i would then need another map done to use that for what would only be a few BHP.
Depending what engine type you have ,you should find you have a 4 bar FPR already, and also TT injectors etc will not fit a large port manifold ( AE
I got mine chipped @ chipped UK via a group buy on another forum.