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The BMW X6 M is definitely one of the weirdest cars I've ever driven
BMW X6 M
BMW X6 M

(Business Insider/Matthew DeBord) Behold, the sport-activity coupe.

It isn't a sports sedan. It isn't an SUV. I'm not sure that it's even a BMW, given my experience of looking at the German automaker's luxury cars.

This is what the BMW X6 M is: a "sport activity coupe," or SAC. It's certainly the oddest segment in the motoring world, outside of "shooting brakes" (two-door station wagons) and limos with hot tubs.

BMW has pretty well owned the SAC space, although last year Mercedes rolled out its GLE Coupe to challenge the bimmermeisters for supremacy.

There's the standard-issue X6, and there's the X6 M, given more warp and woof (much, much more woof) by BMW's M performance division. The run-of-the-mill X6 starts at about $61,000, but once the M dudes get finished with the car, BMW will sell it to you for $115,000 — nicely equipped, as in the case of the "Long Beach blue metallic" version with "Aragon brown full merino leather" interior I recently tested.

What does the extra $54,150 get you? Mind-bending, borderline-disturbing things, as it turns out. You could buy another car or two, obviously, with the difference. But then you'd be deprived of a driving experience so strange that, well, you'll feel incomplete. That is, if you need to drive an un-SUV four-door super-coupe that can give you whiplash if you aren't careful with the throttle; a car that should inspire confidence going around corners but with a curb weight of 5,300 pounds and the stance of a draught horse crossed with Optimus Prime, doesn't.

The X6 M certainly is fun in a straight line, however. The growling, 4.4-liter twin-turbo V8 creates a Matterhorn of torque when you're tooling around on the highway in the placid confines of gear eight and decide to flick it down five whole shifts to third, squeezing the throttle and unleashing the crazy. This car's middle name is "GO!"

Breaking up?

Actually, all of its names are "GO!" The g's come quick — quickest if you're in "Sport Plus" mode across the board, but fairly swiftly even when you're in "Comfort." You're ultimately not going that fast. But you are accelerating at a borderline-alarming pace. It sticks in your head. You're used to this kind of thing if you're driving an M4 coupe (I recently drove the convertible version). In the X6 M, the velocity scrambles your thinking. You're supposed to bond with the furious power of BMW's M cars. But with the X6 M, I kind of wanted a divorce.

BMW X6 M
BMW X6 M

(Business Insider/Matthew DeBord) This is where you adjust the driving modes. The leather, by the way, feels as good as it looks.