BImmerpost is running an image of what appears to be a special version of the X6M. Sources are telling us that M is currently testing this X6M with an uprated twin-turbo V8 and more aggressive weight savings. Why would BMW M waste spend it ‘s time lightening up the 5,300 lbs X6M and not focus on it ‘s core products? The answer likely lies in the popularity of the car in emerging markets such as Russia and China.