Kartboy Lightweight Aluminum Crank Pulley WRX 15-21 / BRZ 13-20 / FR-S 13-16 / 86 17-20 | KB-050-FA/FB

Product Fitment:

2015-2021 Subaru WRX

2013-2020 Subaru BRZ

2013-2020 Scion FR-S

2017-2020 Toyota 86

Unlock smoother acceleration, sharper throttle response, and better engine feel with the Kartboy Aluminum Crank Pulley for Subaru’s FA and FB engine families. Crafted from high-strength billet aluminum and engineered to replace the heavier factory unit, this pulley is a key upgrade for drivers looking to refine their boxer engine’s performance.

• Lightweight Design: Weighs approximately 1 lb—significantly lighter than stock—allowing the engine to rev more freely.

• Precision Machined: CNC-milled and finished for a perfect fit on FA/FB-series Subaru engines, ensuring reliability and durability under load.

• Performance Benefit: Reduced rotating mass means less energy is spent moving the pulley, translating into potential gains in throttle response and smoother operation.

• Made in the USA: Produced by Kartboy, a trusted name for Subaru performance parts, with a commitment to quality and support.

By replacing the heavier OEM crank pulley with this high-performance unit, you’re reducing unnecessary rotating mass. The result is smoother engine revs, a more responsive feel, and an upgrade that not only looks good in your engine bay but performs well under real conditions. Whether you’re daily-driving or pushing for track performance, this upgrade adds value to your Subaru build.