Took out the 6L Hacker and swapped in the Pletty Maxx. Geared 51/17 on 6s A123 and it's a beast still. The RX8 still keeps going and the fan gets a good workout.
Peak power is a bit less then with the Hacker, but I sure didn't seem like it running up and down the street. I'll get a bigger pinion soon and stess the ESC some more.