Stage I: Stage I profiles are designed to offer the widest possible powerband and be compatible with factory valvetrain components. These camshafts are designed to retain stock idle and are currently CARB EO-pending. Upgrading to Skunk2 Racing valve springs is recommended. Stage I profiles are relatively easy to tune for maximum power output.
Stage II: Stage II profiles are more aggressive than Stage I profiles, and are designed for modified engines operating at higher rev ranges. Upgrading to Skunk2 Racing valvetrain components is required for proper operation. Stock idle and emission characteristics may be slightly compromised, but fair-to-good driveability allows them to still be used on dual-purpose vehicles. Proper tuning, an upgraded intake system, and an exhaust system are required in order to maximize the potential of these camshafts. Do not use oversized valves.
Stage III: Stage III profiles are designed for purpose-built race engines with high-rpm capabilities only! Upgrading to Skunk2 Racing valvetrain components and extensive engine work is required for the proper functioning of these camshafts. Compression and engine flow must also be significantly increased. Stage III camshafts should be installed and tuned by professional engine builders only! Do not use oversized valves.
Turbo: Turbo profiles are designed for engines with forced induction. Aggressive lift and valve opening/closing motions allow these cams to maximize power with a minimum amount of overlap. Each profile is designed with extensive input from the top racers in the sport compact industry.