Monday, we tried to do some "Novak Spec" racing. Some of us have SS5800 and we put it in stock mode. We used the same pinions and rubber tires.
Back straight was awesome! There was no discerable differance in acceleration or top speed!
The only problem (and it was limited to me) was that my speed control would overheat and kick out. Later I put in a very low pinion and put it back in open and it actually seemed to run cooler.
I'm goin' to look for a 4300 right now. I think there is potential here to have some awesome spec racing!