first off, love your Z and your future build. Now my 2 cents on what you're about to do. If you say you have some experience in drifting, think again. S30's react like a MR car. I should know, I used to drift competitively using an AW11 with a 170 rwhp engine and major suspension mods and LSD. I learned how to properly initiate and hold a drift with much practice attending drift events (I started in 2003) and spent so much money on tires. Drifting a non-FR car is relatively difficult but very doable. What you need to learn is proper braking and lightning action steering since you have a non power steering car (and because your car is snap happy). Worry about making big HP and larger steering angles. It's good to learn in a car under stock form or close. Your learning curve will just be steeper when your car has so much mods. I am thinking of going back again especially since my good friend is already doing well and kept bugging me but I'm just too broke to compete as a privateer. Welding your diff is a good idea but only if the car is only tracked because driving in the streets will be just plain awful especially making U-turns. As far as suspension is concerned, you need to set up the suspension basically less functional (yes it's sounds stupid but true) in the rear because a less grabier (is that a word?) rear makes it easier to drift but moderate to control. Anyway, that is just my 2 cents. I got my flame suit on so go ahead! =).