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GFB lightweight alternator pulley for 2013+ Subaru BRZ and 2013+ Scion FR-S reduces rotating mass to sharpen throttle response and acceleration by lowering accessory inertia. Machined from a single billet of 6061-T6 aluminum to precise tolerances, the pulley can reduce rotating inertia by up to 85% and may underdrive accessories to cut parasitic load at high RPM without compromising accessory performance, per GFB testing.
GFB 13+ Subaru BRZ / 13+ Scion FR-S Lightweight Alternator Pulley
