GFB 04-10 WRX/STI 3 Piece Under-Drive Pulley Kit w/ Belts (Crank Alternator & Power Steering)

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