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 Camshaft Sensor Adapter

FAST LS2/LS7 Camshaft Sensor Adapter

$52.60

Proflow Fuel Injector Wiring Plug EV1 Bosch Style 2 Pin Include Terminals & Boot

Proflow Fuel Injector Wiring Plug EV1 Bosch Style 2 Pin Include Terminals & Boot

$4.39

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 XFI Fuel Inector Harness For Ford Small Block, FE and Big Block

FAST XFI Fuel Inector Harness For Ford Small Block, FE and Big Block

$309.72

FAST XFI Fuel Inector Harness for GM LS w/ Minitimer Connector Injectors

FAST XFI Fuel Inector Harness for GM LS w/ Minitimer Connector Injectors

$309.72