Internal rotor ignitions are used exclusively for tuning and racing. These high-end ignitions replace the original alternators with interior stator and exterior rotor. The inner rotor of an internal rotor ignition can rev up much faster. ... The ignition spark is a much stronger and more stable and constant than in a standard ignition, and thanks to ignition timing adjustment performance can be optimized even further. So if you are seriously interested in performance optimization and / or competition, there is no way around an internal rotor ignition. We have numerous premium models such as MVT Digital Direct and MVT Premium, Malossi MHR Team 2, Polini Evolution PVL, Italkit Selettra PVL and Curva, Bidalot Factory and our flagship model by Stage6 R/T. Most ignitions are supplied with matching CDI with carefully pre-programmed ignition curves to adjust ignition timing.