The M stands for Motorsport in the BMW M series
BMW i was created in 2011.
The 2014 BMW X6-M has a V8 engine.
The 2011 BMW X5-M has a V8 engine.
The 2013 BMW X5-M has a V8 engine.
The 2012 BMW X6-M has a V8 engine.
The 2011 BMW X6-M has a V8 engine.
The 2011 BMW X6-M has 32 valves.
The 2012 BMW X5-M has 32 valves.
The 2013 BMW X6-M has 32 valves.
The 2010 BMW X6-M has 32 valves.
The 2011 BMW X5-M has 32 valves.