Pulleys - Crank, Underdrive

GFB 08+ WRX/STi / 09+ Forester / 03-09 LGT 3 pc Underdrive/Non-Underdrive Pulley Kit - 2014

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...

GFB 02-10+ WRX/STI Crank Pulley (Not Under-Drive) - 2009

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...

Torque Solution Reversed Intake Manifold Alternator Relocation Bracket Kit: 02-14 Subaru WRX - TS-SU-440BK-K

Torque Solution Reversed Intake Manifold Alternator Relocation Bracket Kit: 02-14 Subaru WRXThis Part Fits:YearMakeModelSubmodel2008SubaruForesterSports 2.5 XT2004-2005,2009SubaruForesterXT2006-2010SubaruForesterXT Limited2005,2010-2013SubaruForesterXT...

Torque Solution Lightweight Crank Pulley & Install Kit: Subaru Impreza 08-11/ WRX & STi 2008+ - TS-SU-207B

Torque Solution Lightweight Crank Pulley & Install Kit: Subaru Impreza 08-11/ WRX & STi 2008+This Part Fits:YearMakeModelSubmodel2008-2011SubaruImpreza2.5i2010-2011SubaruImpreza2.5i Premium2008-2011SubaruImprezaOutback...

Torque Solution Lightweight Crank Pulley: Subaru Impreza/WRX/STi/Legacy/Forester - TS-SU-207A

Torque Solution Lightweight Crank Pulley: Subaru Impreza/WRX/STi/Legacy/ForesterThis Part Fits:YearMakeModelSubmodel2008SubaruForesterSports 2.5 XT2004-2005,2009SubaruForesterXT2006-2010SubaruForesterXT Limited2005,2010-2012SubaruForesterXT...