As said before, you don't need much to drift a 31.
I've drifted mine and all it's got is new shocks, springs, bushes, slotted rotors and rebuilt calipers. Hell, it's got an automatic gearbox and still slides.
But really you'd want an S13 suspension conversion, RB30E+T or an RB25DET, 5 pak button clutch, and a LSD/minispool/welded diff.