Can someone educate me about the possibilities of a motor upgrade in the future? I know Nissan is making their own motor so it's unlikely that some aftermarket motor will just bolt right up. Aside from fitment issues what are some of the limitations of the existing setup? Is it as simple as swapping in a higher KW motor and reprogramming the controller? I recall hearing something about pack voltage being a limiting factor for increasing power output. Please educate me.