2004? You're really planning ahead. I would wait until you get closer to the date when you are going to buy, as the forced induction scene will likely have come a long way by then. As far as an FMU, that stands for Fuel Management Unit, a common item on forced induction engines with return line fuel systems. By sensing boost pressure through a vacuum line plumbed into the manifold, the FMU will incrementally close off the fuel system's return line, which raises fuel pressure at the injectors. It is very important that the rest of the fuel system, (particularly the pump(s)) is designed to flow properly at the higher pressure. On my s-trim Vortech setup, I am using a 6:1 FMU (Vortech's FMU is adjustable, making it compatible with multiple injector sizes), 30 lb FMS injectors, and 2 fuel pumps:190lph intank with Vortech t-rex inline.
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