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 CAN Interconnect Cable

FAST CAN Interconnect Cable

$35.80

FAST XIM Wiring Harness for LS1/LS6

FAST XIM Wiring Harness for LS1/LS6

$607.55

FAST Classic Sequential 4 Cylinder Harness

FAST Classic Sequential 4 Cylinder Harness

$1,120.26

FAST XFI 2.0 Main Harness For Ford Mustang Cobra Jet

FAST XFI 2.0 Main Harness For Ford Mustang Cobra Jet

$3,205.79