When it comes to its size, stature, and sticker price, the Bentley Mulsanne is unquestionably the flagship sedan in the British automaker’s lineup of stalwart vehicles. The Flying Spur, however, while smaller in size, comes with a bigger W-12 engine, which in turn produces more horsepower. For some, these numbers are trivial when looking at overall luxury; but Bentley wanted to provide the 4-year-old Mulsanne model with an additional boost of power and exclusivity for 2015 (as a 2016 model). Enter the Bentley …