4.5/5.5/6.5 faster?
which one provide more starting punch?
which one better top speed?
is it needed a receiver batt.?
thanks!

I race with a bunch of guys that run the GTB with 4 cells. Some of them run a RX pack some don't. I run an SS with 4 cells and no RX pack with no problems. Most of us run the 4300 or 5800.