I have been thinking of the mamba max, but on rc-mosnter.com I can read that it is only for 2-3s lipo - and I´m running 4s won´t that be a problem ?? What aboyt the 9920 ?

But what motor ??

I have a 540c 7xl laying arround and a UBEC. But the 7xl was too musch power for me and my bashing :-)