BMW XM super SUV teased ahead of Sept. 27 debut

BMW M is close to revealing its first standalone model since the iconic M1 supercar launched four decades ago. This time around it will be an SUV, a model to be called the XM, and it’s due for its debut on Sept. 27. A teaser video released on Tuesday gives a taste of the XM’s throaty exhaust note, as well as the design of its light signature…