For sure 4pole motor will fit a 6lbs + 4wd better, but I worry about the esc, seems same spec as old one, which have issue to run 3s, now new 4 pole motor will draw even more power... wonder how the new esc does.
I think the new 4 pole system is much better than the old 2 pole system. I have the old system and now not very happy with it, gets really hot and power hungry so swapped for a 4 pole system. Andy are you going to Lali ?
My motor is 3351R and ESC is with big capacitors. I did not try the old two pole motor, but this set of ESC and motor is good enough for me. I am running 2s only.
If the motor wire is not "rubber" wrapped .. and model number with "R" .. 3355R 3351R.
Esc is easy to tell, can see 3 big capacitors .. But since Traxxas doesn't want to promote their "new 4 pole" system yet, and they still hv lots of 2 pole inventory.
Actually, the most attractive is the Bluetooth telemetry with iPhone. Now I can see the RPM, speed, temperature and voltage of the battery while running. Quite fancy !!