If it were me, I would go 4inch. Theres bugger all from 2-3, only anything above two is illegal and should be engineered to make it legal. That kit has drop boxes and adjustable panhards, so you might aswell go 4. But thats my opinion. But you will need an adjustable drag link.
If not, stick with a decent two inch kit and it will be fine. It will fit 33's under it easily.