Performance car owners want fuel economy and throttle response. That's why they upgrade to the EZ-EFI fuel pump conversion for mpg improvement. FAST has the relay harnesses to compliment this system. These plug-and-play harnesses are simple to install, and they'll hook you up to the precise amount of fuel for optimal performance.

More From This Category

FAST XFI Fuel Inector Harness for GM LS w/ Minitimer Connector Injectors

FAST XFI Fuel Inector Harness for GM LS w/ Minitimer Connector Injectors

$300.98

FAST LS2/LS7 Crankshaft Sensor Adapter

FAST LS2/LS7 Crankshaft Sensor Adapter

$51.08

FAST Dual Precision 0-100 PSI Sensor and Harness Kit

FAST Dual Precision 0-100 PSI Sensor and Harness Kit

$831.24

FAST Single Precision 0-100 PSI Sensor and Harness Kit

FAST Single Precision 0-100 PSI Sensor and Harness Kit

$419.31