My LHS said the extra fan is not needed ( if tuned correctly ) because JP FX engine has big heatsinks on it - 11 fins.
Your photo heatsink has 11 fins too.
I'm just being paranoid because I do computer overclocking for indoor hobbies
. Computer overclocking needs below 40C or sub zero temp to achieve higher MHz.
On Road : Xray NT1 , RX8 , T4 || Mugen Seiki MRX4-R , MTX4 , MTX3 prospec || Tamiya M03 , M04 || Top Racing Sabre FD2
Off Road : Xray XT8 || Hobao Hyper 8
Radio : Futaba 3PKS || KO propo EX-10 eurus