No, you don't need the FMU. The FMU should only be working under boosted conditions anyways, so I don't think it's even doing anything for you. I would just stick an adjustable FPR on there and set it factory pressure (about 39psi) and be done with it.
E
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1991 5.0 LX Coupe - 40,750 miles
331 cu. in. / Tremec 3550 / BFG Drag Radials
12.22 @ 114.31 mph - w/1.89 60'
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