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The GFB underdrive crank pulley kit for Mitsubishi Evolution 4–9 includes the pulley and a belt to reduce rotating mass and sharpen throttle response. Machined from a single billet of 6061‑T6 aluminium and CNC finished, the kit can cut pulley inertia by up to 85%, freeing torque for acceleration. It’s a bolt‑on underdrive solution that may lower accessory parasitic load at high RPM without extra tuning.
GFB Evo 4-9 Under-Drive Crank Pulley w/ Belt
