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 Wiring Pigtail, Early/TPI MAP Sensor to Metripack/LS Harness Adapter, Each

FAST Wiring Pigtail, Early/TPI MAP Sensor to Metripack/LS Harness Adapter, Each

$40.03

FAST XFI Touchscreen Dash/Data Logger

FAST XFI Touchscreen Dash/Data Logger

$2,180.55

FAST LS2/LS7 Camshaft Sensor Adapter

FAST LS2/LS7 Camshaft Sensor Adapter

$51.11

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 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

FAST XIM Wiring Harness for LS1/LS6

FAST XIM Wiring Harness for LS1/LS6

$590.40