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

Proflow Fuel Injector Wiring Plug Denso High Slot w/Lead

Proflow Fuel Injector Wiring Plug Denso High Slot w/Lead

$4.03

FAST Power Adder Wiring Harness for Nitrous and Power Adder Enable/Hold

FAST Power Adder Wiring Harness for Nitrous and Power Adder Enable/Hold

$77.27

FAST XFI Fuel Inector Harness for 4 Cylinder Engines w/ Minitimer Connector Injectors

FAST XFI Fuel Inector Harness for 4 Cylinder Engines w/ Minitimer Connector Injectors

$209.55

Haltech Fuel Injector Adapter - 14mm Base

Haltech Fuel Injector Adapter - 14mm Base

$12.00

Haltech Fuel Injector Adapter - 11mm 1/2 to Full Length

Haltech Fuel Injector Adapter - 11mm 1/2 to Full Length

$12.00