Planning A 1/10th Conversion

[Thunderbruiser]

I am planning to convert an rs4mt into a bl machine..should i just get a trx system or mamba 5700 on 3s 8000 or is there something better I should go for?

i will run 3s max on this setup and already have the batt so i just need the kit and system..what y'all think..also only really lookin for 40 or so mph outta it I care more about rt than power