FAST XFI optional harnesses allow you to utilize your EFI system to its fullest capabilities. These premium constructed wires provide the connections for fan and fuel pumps, a VSS and auxiliary shaft, an analog input, power adders, and more. Connect your XFI system with genuine FAST optional harnesses and extend your vehicle's performance.

More From This Category

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

$4.61

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

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

$81.13

FAST EGT Module Kit for XFI ECU

FAST EGT Module Kit for XFI ECU

$2,599.44

Haltech Fuel Injector Adapter - 14mm 3/4 to Full Length

Haltech Fuel Injector Adapter - 14mm 3/4 to Full Length

$12.60

Haltech Fuel Injector Adapter - 14mm Base

Haltech Fuel Injector Adapter - 14mm Base

$12.60

FAST XIM Wiring Harness for LS1/LS6

FAST XIM Wiring Harness for LS1/LS6

$637.93