Powered by a TwinPower Turbo 8-cylinder V8, the BMW M550i xDrive marks the first time a 5 Series M Performance finds a petrol engine.
Businessmen rejoice. The German sedan for executives gets the M treatment with the 2018 BMW M550i xDrive by BMW Performance. Out early 2017.
The first M5, introduced in 1985, was the fastest production sedan in the world. Does the 2013 BMW M5 compare?