The FMU is the Fuel Management Unit. Here's a link to Vortech's website. They can explain the FMU alot better than I could.
http://www.vortechsuperchargers.com/tech/fmu_sfmu.html
Dan
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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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