ACT XACT Flywheel Streetlite 13+ Ford Focus ST
The ACT Streetlite Flywheel is considered to be one of the most durable flywheels on the market. This flywheel is considerably lighter than stock which means less rotational mass at the crank, which allows for faster revving as well. This flywheel weighs 14.7lbs, and if you're experiencing clutch slippage due to a glazed flywheel, then it may be time to upgrade.
The Streetlite flywheel has been designed for street or drag racing, and they are serviceable and can be resurfaced.