Depends what kinda of drifting. If it's water then you need a crap load more power. If it's snow then maybe better tires(or possibly worse if you want less grip? ), suspension mods, and that should help you go sideways. Honestly the WRX already comes stock with enough to drift very well in the snow. The best thing that will help you drift is practice. My friends tell me it's harder to learn then drifting with a FW or RW because by pressing the gass you will litteraly go sideways and no whip your back out.