GFB Lightweight Non-Underdrive Crank PulleyGo Faster, Add Lightness! Less is more. New Lightweight Crank Pulley (non underdrive) to suit VAG 2. 0 FSI engines. Like all GFB lightweight pulleys, this one begins life as a single 6061 aluminium alloy billet, and is then precision CNC machined to exacting tolerances. We then anodize it black for a stealthy appearance and superior wear resistance. This results in a large saving of 1. 4kg of rotating mass over the factory pulley, without sacrificing
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