Mystery BMW X6 Prototypes Scooped in Michigan

One of our readers stumbled upon these heavily camouflaged BMW X6 prototypes this weekend at Rochester Hills in Michigan. All three test mules featured a huge power bulge on the hood and extremely fat rubber -315/35 R20. Maybe an “M” version fitted with the M5/M6 V10 507Hp powerhouse? While we can’t rule it out, we believe that the X6 test cars seen here are probably prototypes of the forthcoming