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The VMP unit is designed to be always on, it's a high efficiency unit and does not require any additional power wires or pressure switches. We do include a 40 amp fuse to replace the stock 20 amp fuse in position F13 on 11-12 Shelby GT500s. We hook ours up all the time to prevent any pressure spikes that may occur when a booster is triggered in the middle of a pull by a pressure switch. In the case of 11-14 GT500, the computer is already modulating fuel pump duty cycle and only giving the car the pressure and flow it needs. For tuning, we recommending you reduce the Fuel Pump Voltage Table (under Returnless fuel pump) by 1-2 volts all over and fine tune from there by datalogging.

This Part Fits:

Year Make Model Submodel
2011-2012 Ford Mustang Shelby GT500
VMP Performance 11-12 Ford Shelby GT500 Plug and Play Fuel Pump Voltage Booster

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