I have the water cooled version sold by ETTI. Even without a big heat sink, it stayed cool. If only Castle would make a controller using those DPAK instead of the SO8 package MOSFETs. Here is a picture of the MOSFET side of the controller. It was taken by a nice guy from a boat forum.
I have no clue . It might be because of the BEC thingy there or maybe because it's water cooled. I just had to try it out and see if it was any good. I asked the person who sells the ETTI if they will have a car version, but nothing yet.