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

$51.08

FAST Weatherpack/TPI Style IAC to Metripack/LS Style Harness Adapter Pigtail, Each

FAST Weatherpack/TPI Style IAC to Metripack/LS Style Harness Adapter Pigtail, Each

$39.81

FAST Single Sensor 200 PSI Harness XFI

FAST Single Sensor 200 PSI Harness XFI

$407.30

FAST XFI Fuel Injector Y Adapter Harness for Multiple Injectors

FAST XFI Fuel Injector Y Adapter Harness for Multiple Injectors

$300.98

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

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

$250.82