I know a couple guys are running Hot shots CDI. I bought one too but haven't used it yet. Suppose to be better than stock , Higher redline limit, smoother throttle, but don't know yet.
Unless they changed something which is highly doubtfull.. it may have been a little hotter spark (which really would do nothing) but they did not change the advance or curve one bit.
the cdi box will override your rev limiter. but ive heard if you over rev your bike once you install the cdi box then you can blow your top end real easy. but i dont know for sure
just do a little math, as long as you keep piston speed avg below 4000 fpm. Remember, you can raise the revlimiter to 20,000 rpm, doesnt mean a thing unless your pipe, porting and carb will support it.