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GFB lightweight crank pulley for 2002–2010 WRX/STI EJ engines reduces rotating mass to sharpen throttle response and improve acceleration feel. Machined from billet 6061-T6 and CNC-finished, the pulley cuts inertia—freeing torque that would otherwise accelerate the pulley. Kits can offer further gains where underdrive is appropriate, tested to preserve accessory performance.
GFB 02-10+ WRX/STI Crank Pulley (Not Under-Drive)
