GFB 02-10 WRX/STI 2 Piece Under-Drive Pulley Kit w/ Belts (Crank & Alternator)

It might be hard to imagine how reducing the mass of a pulley makes a car go faster, but accelerating a heavy factory pulley from say 3000-7000 RPM in a second or two saps a measurable amount of torque. GFB Lightweight Pulleys reduce inertia by up to 85 percent, so most of the torque that used to accelerate the pulley can now be applied to the wheels.

This Part Fits:

Year	Make	Model	Submodel
2004-2005	Subaru	Forester	XT
2006-2007	Subaru	Forester	XT Limited
2005	Subaru	Forester	XT Premium
2001	Subaru	Impreza	L
2001-2002	Subaru	Impreza	Outback
2001-2002	Subaru	Impreza	RS
2002	Subaru	Impreza	TS
2002-2003	Subaru	Impreza	WRX
1998-2000	Subaru	Legacy	Brighton
1998-2002,2005-2006	Subaru	Legacy	GT
1998,2000-2002,2005,2007	Subaru	Legacy	GT Limited
2006-2007	Subaru	Legacy	GT spec.B
1998-2002	Subaru	Legacy	L
1999	Subaru	Legacy	L 30th Anniversary
1999	Subaru	Legacy	Limited 30th Anniversary
1998-1999	Subaru	Legacy	Outback
1999	Subaru	Legacy	Outback Limited
1998	Subaru	Legacy	Postal
1999	Subaru	Legacy	SUS 30th Anniversary