vortex has revlimiters that can be programmed, along with the option of downloading 2 different timing curves to it. it has a handle bar mounted switch that you can toggle between curves with.
the ron wood is also a good ignition, a little less money but does not have a revlimiter programed(rev it til the moon if you dont watch it) but has a good preset timing curve and wont kill the one way starter bearings like the cheaper ignitions which advance timing way too early.