GFB Subaru 08-21 WRX / 08-21 STi / FXT / LGT 3 pc Underdrive/Non-Underdrive Pulley Kit

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
2009	Subaru	Forester	XT
2009-2010	Subaru	Forester	XT Limited
2010-2013	Subaru	Forester	XT Premium
2011-2013	Subaru	Forester	XT Touring
2009-2010	Subaru	Impreza	2.5 GT
2008-2014	Subaru	Impreza	WRX
2010-2014	Subaru	Impreza	WRX Limited
2009-2014	Subaru	Impreza	WRX Premium
2008-2014	Subaru	Impreza	WRX STI
2011-2014	Subaru	Impreza	WRX STI Limited
2010	Subaru	Impreza	WRX STI Special Edition
2006-2009	Subaru	Legacy	2.5i
2007-2009	Subaru	Legacy	2.5i Limited
2007-2009	Subaru	Legacy	2.5i Special Edition
2009	Subaru	Legacy	3.0 R
2008-2009	Subaru	Legacy	3.0 R Limited
2003-2006	Subaru	Legacy	GT
2005,2007-2009	Subaru	Legacy	GT Limited
2006-2009	Subaru	Legacy	GT spec.B
2005	Subaru	Legacy	i
2003-2004	Subaru	Legacy	L
2004	Subaru	Legacy	L 35th Anniversary
2003	Subaru	Legacy	L SE
2005	Subaru	Legacy	Limited
2015-2020	Subaru	WRX	Base
2015-2020	Subaru	WRX	Limited
2015-2020	Subaru	WRX	Premium
2015-2020	Subaru	WRX STI	Base
2015	Subaru	WRX STI	Launch Edition
2015-2020	Subaru	WRX STI	Limited
2020	Subaru	WRX STI	S209
2016	Subaru	WRX STI	Series.HyperBlue
2018	Subaru	WRX STI	Type RA