Oh, that thing. I've seen them advertised on ebay- not the best quality truck to be brutally honest, you'd have been better off buying a wild-dagger or something similar from a big name company. Anyway, I would go very carefully about putting a BL motor setup into it, chances are the drive train will fly apart and there are no 'upgrade' parts that I know of, only replacements. Better off getting a more powerful brushed motor like a titan 550 or something like that.
Hmm, going by some english specs I found it only weighs about 1.1kg/2.5lbs? If that is anything near correct, then an S can BL motor would be plenty of power.Just match the number of turns to the voltage you plan to use, and aim for about 30-35,000 rpm & 35mph. I could be completely wrong and it turns out to be a tough little bugger. An MM esc would go well with that motor too.