BMW calls this the "Ultimate Racetrack." Even if it weren't all CGI, we'd probably say that isn't the case, but it sure as hell makes for one fun-looking commercial. The new spot features the not-quite-M3, not-quite-M5 M4. That's the M4 that has 425 horsepower from its 3.0L inline-6. Watch it put that to work with lots of slow motion, exhaust growls, and rubber bits flying all over the screen in this beautifully directed one-minute video.