AH - so after a quick search, the Ford does used a high pressure cam driven fuel pump similar to the Mazda. The Mazda uses one from Hitachi and the Ford uses a Bosch.
From what a guy on an EcoBoost forum said, the ST's CDFP is set at its maximum threshold just like the Mazda's is. These fuel pumps are set to push out around 1600psi under full boost (pretty nuts), and modification and tuning will require more, which puts the ST in the same modding situation as the Mazda.
I'd look into what's available for aftermarket. Sounds like with even a stage 1 tune on an intake you'll run into some moderate fuel starvation problems.
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