The latest BMW X5 is an excellent SUV, offering handsome styling, a luxurious interior, and a sporty driving character. This particular example is an M50i model that features a 523-horsepower twin-turbo V8 and some desirable factory equipment, including the Executive, Climate Comfort, Driving Assistance Professional, and Parking Assistance packages, 22-inch Style 742M wheels, and a Bowers & Wilkins Diamond surround sound system.  Power comes from a 4.4-liter twin-turbocharged V8, rated at 523 horsepower and 553 lb-ft of torque. Output is sent to all four wheels via an 8-speed automatic transmission and BMW's xDrive permanent all-wheel drive system