The Extreme Heavy Duty Upgrade Kit transforms your already-tough 2WD Slash^® or 2WD Raptor^® into the ultimate bashing machine. Engineered for brushless power systems, the kit includes a full complement of driveline and suspension parts designed to work together as a complete package. Whether you're sending it at the skate park or preparing for a speed run, the Extreme Heavy Duty Upgrade Kit is battle-hardened to withstand brutal punishment and come back for more.