Massive Speed System - Underdrive Light Pulley Systems

Installs in place of your factory crank pulley. Free's up some nice HP. Zetec motors are INTERNALLY ZERO balanced, meaning the factory pulley IS NOT a harmonic dampener of any kind. This means swapping the crank pulley will have NO adverse effects on engine longevity, Massive's staff has logged literally over 500,000 collective miles with these pullies installed and have seen NO unsatisfactory qualities. Weight differences between this and competitors pulleys is less than 2 ounces yet pulleys offer 90% higher total rigidity and far better overall strength. Fairly straight forward installation, comes with correct length belt and instructions. Should take less than 1 hour for a novice car guy (or girl). Pullies come anodized MASSIVE PURPLE. Has the Massive logo and a crank position mark machined into the faces.