In my experience, the 4300 is right between stock and 19T. Novak has a SS13.5 on the way that's supposed to be very much like a stock motor.
I can't make a 19T purr like Eddie can, but in my experience, the 5800 is considerably faster than any 19T. Most people say it's closer to a 15T or 17T. I've raced some pretty fast guys in 19T, and the 5800 noticeably faster.
The 4300 is 10.5 and the 5800 is 8.5. I imagine a 9.5 would be really close to a 19T, but there isn't one available yet.