It’s tempting to view the BMW X6 M through the same lens that you would view the Cadillac Escalade EXT — you know, the pickup truck — a one-off anomaly that history will look back on and shrug. Hubris for the sake of hubris, etc. But that sure ain’t how Mercedes views the stylized attack wagon from BMW. No, Mercedes went on ahead and recorded a note-for-note cover version of BMW’s wacky song. Why? Follow the money, as BMW sure made a wheelbarrow full of it with the last generation X6M. This one is all new, as is the GLE63 Coupe S. But which hunchback of the Nürburgring is best? On this episode of Head 2 Head presented by Tire Rack (http://www.tirerack.com), host Jonny Lieberman finds out!