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FAST offers several main harness options to accommodate most customers' needs. The XFI Main Harness is responsible for connecting your XFI ECU to sensors as well as digital dashes, EGT modules, and various optional accessories. The Main Harness also handles communication between the ECU and ignition devices. Main harnesses are available in TPI, LT-1, LS-1 through 9 (including truck/suv designs), Modern Hemi, Carburetor Conversions and even Rear-Engine Dragsters and Boats. FAST also offers Main Harnesses that come terminated on the sensor side but non-terminated on the ECU side to allow for a truely custom fit. All terminals, seals and connectors are available individually, so don't hesitate to try your hand at crafting your own custom harness from start to finish.
Fuel Management Wiring Harness
Wiring Harness
Works well out of the box with GM LS1,LS2,LS3,LS6,LS7,LS9 along with GM LS Based Pickup Truck and SUV applications.
XFI Main Harness 301108 fits GM LS style sensors.
XFI Main Harness designed for engines whose sensors feature GM LS style sensors.
XFI Main Harness LS

Vehicle Fitments:

Year	Make	Model	Submodel
2004 - 2007	Cadillac	CTS	Base, V
2002 - 2006	Chevrolet	Avalanche 1500	LT, Base, LS, Z71
2002 - 2003	Chevrolet	Avalanche 1500	On Road Edition, North Face
2003	Chevrolet	Avalanche 1500	WBH
2004 - 2006	Chevrolet	Avalanche 1500	Z66
1998	Chevrolet	Camaro	Lujo
1998 - 2002	Chevrolet	Camaro	Z28 SS, Base, Z28
2014 - 2015	Chevrolet	Camaro	ZL1, LT, SS, LS, Z/28
2008	Chevrolet	Corvette	427 Limited Edition Z06
2003	Chevrolet	Corvette	50th Anniversary Edition, 50th Anniversary Edition Pace Car
1997 - 2013	Chevrolet	Corvette	Base
2010 - 2013	Chevrolet	Corvette	Grand Sport
1998	Chevrolet	Corvette	Indianapolis 500 Pace Car
2013	Chevrolet	Corvette	LT, 427
2001 - 2013	Chevrolet	Corvette	Z06
2011	Chevrolet	Corvette	Z06 Carbon
2009 - 2013	Chevrolet	Corvette	ZR1
2003 - 2007	Chevrolet	Express 1500	LS, Base
2006 - 2007	Chevrolet	Express 1500	LT
2003 - 2007	Chevrolet	Express 2500	Base, LS
2006 - 2007	Chevrolet	Express 2500	LT
2003 - 2005	Chevrolet	Express 3500	LS, Base
1999 - 2007	Chevrolet	Silverado 1500	Base, LS, LT
2002	Chevrolet	Silverado 1500	Custom
2004 - 2006	Chevrolet	Silverado 1500	Hybrid
2007	Chevrolet	Silverado 1500	LTZ
2003 - 2006	Chevrolet	Silverado 1500	SS
2002 - 2007	Chevrolet	Silverado 1500	WT
2004	Chevrolet	Silverado 1500	Z71
2007	Chevrolet	Silverado 1500 Classic	WT, SS, Hybrid, LS, LT
2003 - 2004	Chevrolet	Silverado 2500	400 SS
2001 - 2002	Chevrolet	Silverado 2500	Custom, Cheyenne
1999 - 2004	Chevrolet	Silverado 2500	LT, Base, LS
2004	Chevrolet	Silverado 2500	WT
2006	Chevrolet	Silverado 3500	HD
2004 - 2006	Chevrolet	Silverado 3500	LS, LT, WT, Base
2003 - 2006	Chevrolet	SSR	Base
2000 - 2006	Chevrolet	Suburban 1500	Base, LS, LT
2006	Chevrolet	Suburban 1500	LTZ
2004 - 2006	Chevrolet	Suburban 1500	Z71
2000	Chevrolet	Tahoe	Limited
2000 - 2006	Chevrolet	Tahoe	LS, Z71, LT, Base
2006 - 2007	Chevrolet	Trailblazer	A, B, LS
2006 - 2008	Chevrolet	Trailblazer	Base
2006 - 2009	Chevrolet	Trailblazer	SS, LT
2003 - 2004	Chevrolet	Trailblazer EXT	LS, North Face, LT
2004	GMC	Envoy XL	SLE, SLT
2003 - 2006	GMC	Savana 1500	Base
2006	GMC	Savana 1500	LT, LS
2003 - 2005	GMC	Savana 1500	SLE
2003 - 2007	GMC	Savana 2500	Base
2007	GMC	Savana 2500	LT, LS
2003 - 2005	GMC	Savana 2500	SLE
2004 - 2007	GMC	Savana 3500	Base
2006 - 2007	GMC	Savana 3500	LT, LS
2004 - 2005	GMC	Savana 3500	SLE
2002 - 2005	GMC	Sierra 1500	Base
2001	GMC	Sierra 1500	C3
2002	GMC	Sierra 1500	HT
2005 - 2006	GMC	Sierra 1500	Hybrid
1999 - 2007	GMC	Sierra 1500	SLE, SL, SLT
2002 - 2007	GMC	Sierra 1500	WT, Denali
2007	GMC	Sierra 1500 Classic	Hybrid, SLT, SL, Denali, SLE, WT
1999 - 2001	GMC	Sierra 2500	SLT, SLE, SL
2001	GMC	Sierra 2500 HD	SLT, SLE, SL
2001	GMC	Sierra 3500	SLE, SL, SLT
2006	GMC	Yukon	SL
2000 - 2006	GMC	Yukon	SLT, Denali, SLE
2001 - 2006	GMC	Yukon XL 1500	Denali
2006	GMC	Yukon XL 1500	SL
2000 - 2006	GMC	Yukon XL 1500	SLE, SLT
2000 - 2001	GMC	Yukon XL 2500	SLT, SLE
2005 - 2007	Hummer	H2	Adventure, Luxury
2003 - 2007	Hummer	H2	Base
2007	Hummer	H2	Special Edition
1998 - 2002	Pontiac	Firebird	Base, Trans Am, Formula
2004 - 2006	Pontiac	GTO	Base