Came across this interesting news for you high HP guys. Finally some more progress is being made on the N54 fueling system. This is a Walbro F90000267 E85 pump rated at 400LPH @ 80psi and from 800-950hp. As of the last update it's installed and running well.
For current info check out the DIY section on N54tech. Its updated regularly with more current info.
Mike