RE: which set-up would be faster
yeah the 4600 motor is fine to that voltage, and i'm shocked that poeple are so quick to jump to assume that an 12 cell battery = a dual battery setup in a big heavy MT, i have an 11 cell setup for a 1/10 2wd ST with that very same motor, so please don't be quick to jump to assumtions about what a guy is using a setup for instead of offering blind and possibly usless/wrong advice for the situation ask your question and or provide a reason for your advice
the lug