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 Analog Input Harness for XFI

FAST Analog Input Harness for XFI

$90.23

FAST XIM Wiring Harness for LS1/LS6

FAST XIM Wiring Harness for LS1/LS6

$590.40

FAST Single Sensor 200 PSI Harness XFI

FAST Single Sensor 200 PSI Harness XFI

$407.30

FAST LS2/LS7 Crankshaft Sensor Adapter

FAST LS2/LS7 Crankshaft Sensor Adapter

$51.08