The Sprint 2 drifts great stock.

>You should probably lock the rear diff
>Set the rear camber to 0
>Buy some drift tires (link below)
>Buy some stiff rear springs (link below)

I also bought the Chameleon 2 Pro motor for drifting, but I also advanced the stock motor that came with it and it works fine. I set the front almost toe-out to help the car turn-in, but im always changing it. Its whatever you prefer as far as setup, but the car would barely drift at high speeds until I locked the rear diff.

Best HPI drift tires for electric:
http://www2.towerhobbies.com/cgi-bin...p?&I=LXMRD5&P=

Rear springs I use
http://www2.towerhobbies.com/cgi-bin...?&I=LXN175&P=7