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 LS2/LS7 Crankshaft Sensor Adapter

FAST LS2/LS7 Crankshaft Sensor Adapter

$52.57

FAST XFI Fuel Inector Harness For Buick V6 w/ Minitimer Connector Injectors

FAST XFI Fuel Inector Harness For Buick V6 w/ Minitimer Connector Injectors

$258.09

FAST Analog Input Harness for XFI

FAST Analog Input Harness for XFI

$92.85

Haltech Fuel Injector Adapter - 10.5mm Nissan RB26DETT GTR

Haltech Fuel Injector Adapter - 10.5mm Nissan RB26DETT GTR

$12.00