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If the kit is complete it comes with a fuel management unit(FMU).. a fancy name for a boost regulated valve that you plumb into the fuel return line. It restricts fuel flow back to the tank proportional with boost pressure which raises fuel pressure across the injectors and as a result more fuel is injected into the motor. It's simple but works very well.
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Paul O
1990 F150 4x4 XLT X-Cab 5.0, 3.55LS, Comp XE264HR-14, Flowtech LT's to 3" single, FRPP Mass Air Conversion, TweecerRT with BE, Innovate LC-1 wideband O2
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