Get the 215/40's. The stock setup has an overall height of 611mm and the 215/40 would have a 603mm overall height. Not a huge diff at all. The 225/40 is the exact one though also being 611mm, but I think you can only get Nitto's in that size and I don't like Nitto too much. Plus the 215's will give you marginally better steering feedback than the 225s.
I would get 215/45's if the road in ur area are rough/bumpy and what not!
Yes, I know the 45's are larger than the stock radius by like 2%, while the 40's are smaller than stock by 1.xx% By I personally would prefer to give up a lil speed & acceleration for the sake of having a lil taller tire for better rim protection. Just MO!
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