Increase your Top end. Improved throttle response and spark energy, Plug & Play, Replaces your stock CDI, Installs in minutes. Industry leading 2 YEAR WARRANTY! Stage 3 vs Stage 2? - AMR's newest Stage 3 rev box not only removes the limiter found in the stock CDI unit, it has the most Aggressive Timing Curve possible, built in. The Stage 3 box will give the motor better throttle response than the AMR Stage 2 (and most other CDI units on the Market) We recommend the Stage 3 if you have any Exhaust / Air modifications or plan on adding them in the future.
Had Stage 2 and coil prior to upgrading to 3. 3 has bigger curve allowing higher rev and quicker getting there. While no HP increase, still worth the $$!