I dont recall if the xmod used 130 or 180 motors at the moment, but I think they used 130's.
the mini-z's use 130's, so any aftermarket mini-z motor should be a good drop in.
unfortunately most are tuned for high rpm low torque, so I don't know how well they'd run on a micro-t with the larger heavier tires.
I haven't gotten one yet, but I do want one