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
2008	Subaru	Forester	Sports 2.5 XT
2004-2005	Subaru	Forester	XT
2006-2008	Subaru	Forester	XT Limited
2005	Subaru	Forester	XT Premium
2003-2004	Subaru	Impreza	Outback
2005	Subaru	Impreza	Outback Sport
2003-2005	Subaru	Impreza	RS
2003-2004	Subaru	Impreza	TS
2002-2007	Subaru	Impreza	WRX
2006-2007	Subaru	Impreza	WRX Limited
2004-2007	Subaru	Impreza	WRX STI
2007	Subaru	Impreza	WRX STI Limited
2006-2007	Subaru	Impreza	WRX TR