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Why are you running a b7 head?? I'd run a A6 or a Z6 head before a b7. As far as the FMU goes, I don't think you'll need it if you are running the 450cc injectors and the upgraded fuel pump. Also, another thing that I didn't see you mention was engine management - that is the key to any good reliable turbo setup. Usually this means adding some kind of air-to-fuel and timing management system. A AFC or rechipped ecu running turbo-edit or other comparable software should work awesome for you.