Possible BMW X5M, X6M Prototypes Spotted In Spartanburg

Some are suggesting that the BMW X5 and X6 prototypes you see here will wear the sacred "M" badge when they reach production. The rules used to state that all BMW "M" cars must be naturally aspirated and rear-wheel-drive. But with rumors of turbochargers being bolted to future M-models » 8/25/08 11:00am 8/25/08 11:00am, and now the prospect of these…