Ackbar is correct. A 12:1 ratio FMU will add 12 psi of fuel for every 1 psi of boost. 12psi (fuel) x 6psi (boost) = 72 psi that will be added to your static pressure to acheive your total fuel pressure under boost. If it were me, I'd toss the FMU and go with bigger injectors (30#)...don't forget about a fuel pump too.
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~Dan
2001 SVT Lightning 
89' GT : Taking up garage space and waiting for a buyer...
Rice Hater's Club - Member #11
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