This upper level X5 upgrades to the 4.8 liter V-8, which bumps this SUV's horsepower from 260 to 350.  The V8-equipped X5 will run from 0 to 60 miles per hour in just 6.4 seconds. The same six-speed automatic transmission and XDrive 4WD system is paired with both engines.  This model includes a few additional standard luxury features: leather upholstery and burl walnut trim.  Options a sport suspension, navigation system a sunroof, Bluetooth, a backup camera, and a rear seat entertainment system.  Most are only available through packages.