Need response from a Castle tech for MMM question

Thank you to BrianG, TruckBasher and JoeLing for your PM and your help, so if you have great results with your mod V2, i'll be more confident to run mine .

But i need to know if i'am better to mod it as soon as i'll recieve it or wait until it died. But if i wait, i risk to have a fire on the ESC, so the mod will be impossible.

And after your mod it, should i run a fan on it power by the Rx or you can run it without fan??