The Vauxhall VXR8 GTS versus the BMW M5 Competition Package, basically big V8 sedans going sideways in this episode of AutoCar UK.  The cheaper VXR8 GTS uses a supercharged V8 pumping out 577 horses and the M5 Competition Package uses a twin-turbo V8 producing 567 horses.  It’s all about drifting in this challenge battle between these two V8 brutish sedans.