Castle 2200 on 4s or 6s

So lets say I really want to have fun here

Im going to get a truggy, either a MBX5T, X2, or a RC8T, I want to get the castle combo, but I want the motor thats in the E revo BL, I think the black motor looks better. How will I go about this? Is castle going to sell the combo both ways, or is there going to be the green for castle, and if I want the black version it comes from traxxas? Or how is it going to work?

I want to race the trugg, so 4, or 5s for the track, But I have to buy a 6s and just have some stupid overpowered fun. On 6s where do you gear the car? With that high RPM, it will need a load so it wont be over revving (gearing down from normal) right? So Do you use the same gearing, or?

Thanks!