Simulation tyres also do a world of good they help you achive long continuous drifts. Weight reduction also helps, and if you want to induce more oversteer make the rear brakes stronger than the fronts.
i dont know if this is still being watched but in real cars super stiff springs damper and stabalizers with low ride height and a locked diff (lsd initial = max, lsd accel = min) and a stage 1 power upgrade will make it drift controllably & consistently