Sleeper Cars

2018 BMW M550i is one of Road & Track's sleepers

2018 BMW M550i is one of Road & Track’s sleepers

Now that the F90-generation BMW M5‘s release is imminent, many enthusiasts have forgotten the lesser BMW M550i xDrive. However, that’s actually sort of a good thing. Like many M Performance models, the soon-to-be-released M550i is…