Since its a fairly heavy car, you want to get some weight reductions (And such)..
Make sure you have some stiffer springs too, then try to lower the ride height.
I would keep the power stock, I think it already has around 460(?)hp, so thats pretty good, taking you will also have some weight shedded off.
Any RWD car can be a drifter with the right tunings and upgrades.. So just make sure its light enough to slide more (I wouldn't do too light though, I find those tricky/too fast sliding).
P.S. keep your TCS on 0 so you can get the power to push it around those corners.