[snellemin]

Disabling the BEC does decrease temps. But that is with ESC's that have Linear bec built in. Switching becs are more efficient thus less heat. I've been using Dimension engineering BECs on my smaller ESC, just so I can run higher voltages in my old dragracing days.

Using a external bec with the MMM is useless and won't gain you anything. Only time the BEC is used, is during steering and braking if a mechanical brake system is used. Braking is at the finished line and steering is at a minimum.

The extreme drag racers, go as far as removing the heatsink on the MMM. But never add a external BEC. That is just unnecessary weight.

With the Dimension Engineering BEC there is no need to cut/remove the red wire.