Vortech FMU Kit (Fuel Management Unit) for 87-93 Mustang 5.0L with forced induction. Ratio is 4:1 which is generally suitable for 38-42lb injectors. Brand New in the box and ready to install.Comes with Mounting Bracket Fasteners, Fuel Lines, Vacuum Tube, 1 Zip Tie, and Instruction Sheet. I searched high and low to find this black FMU to match the rest of my setup... I didn't want a blue item that would look out of place. Also this one is Laser-Engraved with the Vortech Company Name and Logo, which they discontinued later. The Supercharger Setup shown in the last picture will soon be listed as the car is going back to N/A. Its a Vortech V2 with Mounting Bracket, Discharge Tube, Mondo Bypass Valve, Supercharger Intake "U" Pipe, Air Filter Cover, Crank Pulley, Belt, Tensioner wheel and bracket, I also have a Brand New 8:1 Black FMU that I was going to use with 24lb injectors and a New T-Rex 255lph Inline Fuel Pump... message me if you're interested and I'll setup a listing. The 10:1, 8:1 and 7:1 FMUs are for Vortech applications that require less fuel pressure to maintain safe air-to-fuel ratios. The 6:1, 4:1 and 3:1 FMUs were designed for high-output custom applications where larger than stock injectors have been employed. For example, the 6:1 FMU can be used on Mustangs using either 30 or 36 lbs. per-hour injectors. The 4:1 unit was designed for either 38 or 42 lbs. per-hour injectors in the same application. Vortech FMU Recalibration Kits include a new ring, washer and fluorosilicone diaphragm. Recommended calibrations for commonly used injector sizes: 12:1 - 19lb./hr Injectors 10:1 - 24lb./hr Injectors (Cobra) 8:1 - 24lb./hr Injectors (GT/LX) 6:1 - 30lb./hr Injectors 4:1 - 38/42lb./hr Injectors 3:1 - 50lb./hr Injectors For conversion from CC injectors, divide by 10.5 (i.e. 440cc injectors = 42lb./hr)