Ive been down this road with the Mazda's, so here is something i suggest. Both Ford and BMW use the Bosch setup for DI. There is a company hanging out on the bimmer forums that have a new HPFP upgrade that should work for us, if not, slightly modified, will work for us. If i had the time right now, i'd just post the info, but its easily obtained by hitting some of the x35 forums around.
I think they can support up to 750hp now..