Stock size was 205/50/17 on the 2.4 SS so I went with 225/45 which is nearly identical.

So far, my first impression is that the cornering absolutely destroys the P6's, road noise is fairly quiet for a 45 series tire, and it soaks up the bumps okay. It likes to wander when the pavement is uneven, but I think all tires do that. Anyways, so far so good. I bought them as all-seasons so I will be running them in the dead of winter here in NH.