Careful...I've had lots ..
of experience with this setup, especially in last month or so. At this time, I would avoid the PS2's in this size. I have been thru a total of 6 tires in these sizes and have obtained only 1 that is round. Michelin is aware of the problem although they deny it (as usual). I ended up going back to the original Pilot Sport. It probably does not have the ultimate grip of the PS2, nor is as good in the wet, but I'd rather have tires that are round. Currently, there is no guarantee that these sizes of the PS 2 are round. I just finished another set of SO3, and while they were quite good when they are new, after 4k miles or so they were horrible. Noisy and all over the place, I'm sure it was partly due to the fact that they couldn't be rotated. It's an excellent tire, but I just don't think it is as compatible with Benz cars as it is with BMW or Porsche cars. If you've just got to have a Bridgestone, I did have better overall experience with the RE040.
You might want to check over at the Roadfly M3 E46 board to see other roundness problems that customers are having with PS2's. Hope this helps.