19x8.5 on the front 19x9.5 on the rear
Yokohama AVS's 235/35 on the front 265/30 on the rear.
In terms of how they changed the car, I really can't notice a difference. I think the rotational mass of the stock rims is out further than these, so even though they weight a tad more, I think rotational inertia is nearly the same, if not less (since the tires probably weight less too)
Talk to Rishie at Auto RnD for JDM rims http://www.autornd.com/