nb...did you consider buting the M3s for the stock Xfire rim size? Obviously a 19" rear snow tire still has a lot of surface area, but I'm sure they are better than the Contis or Michellins. Just curious . I'm considering getitng those tires for the stock rims and leaving them on year around, the Michellins are just to sticky for 215hp...I'd like the rear tires to break free on demand.