Founded in 2001 as the first manufacturer of aftermarket, performance billet camshafts for the dirt bike and ATV market. Today Hot Cams manufacturers almost 250 unique camshaft profiles in its Urbandale, Iowa facility. Stage 2 exhaust. Added top end over Stage 1. An incredible way to boost the midrange and top-end horsepower. Increases over-rev on motorcycles and ATVs. Easy to install with minimal valve adjustment and re-jetting requirements. The camshaft uses such precise engineering and build quality that they are consistently voted top product of the year. Note: Intake and exhaust cams sold separately. Detailed Specifications: Exhaust duration (degrees at 1 mm): 260.390. Exhaust cam lobe lift (mm): 10.160. Exhaust lobe center (degrees): 106.450. Exhaust cam valve lash (mm): 0.185.