Scion FR-S Pulley Kit by Go Fast Bits (GFB) — Lightweight Non-Underdrive, 2013. This precision 3-piece set reduces rotating mass for a sharper, more responsive drive.

Machined from a single billet of 6061-T6 aluminum, this kit replaces the factory crank, alternator, and water pump pulleys. Cutting inertia by up to 85% versus stock helps the FA20 rev quicker and sharpen throttle response without changing accessory speed. The non-underdrive design preserves charging and cooling performance, and it installs as a straightforward bolt-on with no tuning or supporting mods.

Features

• 3-piece kit: crank, alternator, water pump
• 6061-T6 billet, precision CNC machined
• Up to 85% inertia reduction vs. stock
• Non-underdrive; accessory performance maintained

Questions about fitment or install? Call our team. We offer installation and customization at our Austin, Texas and Los Angeles, California area shops: 512-982-9393 (TX) and 562-981-6800 (CA).

Buying multiple items? Contact us for shipping discounts. We install on premises at both locations.

CA Residents: WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov