I was afraid it would be too tall of a sidewall. Unfortunately, I just can't bring myself to buy a Khumo tire (there is no logical reason). I really wanted the PS Super Sports, or a Dunlop, Bridgestone, Pirelli, Continental tire equal to the Michelin. I don't mind the Yokohama, but it and the Dunlop Direzza's are pretty loud compared to the Michelin. At least, that's been my experience when driving on them. In the end, I guess I'll just go with the Yoko's, since they look to do a tad better in the rain. I appreciate you guys chiming in.
On another note, with a 18x10 40mm offset rear wheel, I am assuming that a 265/35/18 is a better choice than a 255/35/18. Would that be the correct assumption to make? I figure now that I know I have to get the 215/40/17 for the front, I'd better make sure that I get the correct rear size too.