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GFB lightweight pulley kits for 2008+ WRX/STi, 2009+ Forester and 2003–2009 Legacy GT are offered as three-piece underdrive or non-underdrive kits (crank, alternator and power steering pulleys). Machined from billet 6061-T6 and CNC finished, the kits reduce rotating inertia—listed reductions up to 85%—to sharpen throttle response and acceleration without requiring supporting modifications, while underdrive options lower accessory parasitic load when desired.
GFB 08+ WRX/STi / 09+ Forester / 03-09 LGT 3 pc Underdrive/Non-Underdrive Pulley Kit
