We have been running a 13.5 1S class for several weeks at our track. Everyone has been very close in speed until lately. A couple of racers have shown up with the Ballistic motors from Novak. Everyone else is running the older 13.5 motors (mine is about 3 years old). I have been racing for many years and understand that setup is key, but their seems to be a major difference in speed. Is their any difference between the ballistic 13.5 and the older 13.5s? Thanks in advance for any answers.