“SUV racing will be the next big thing in motorsports,” said no one ever. Unless you count the Dakar Rally or SCORE off-road racing. (And I do remember seeing a 2004 Jeep Grand Cherokee with a Tiki Bar theme getting lapped numerous times at a LeMons race.) Seriously, though, it’s not a thing. And yet here I stand next to a new 2020 BMW X5 M Competition, a high-output variant of the freshly redesigned and already track-capable 2020 BMW X5 M Sports Activity Vehicle.  I can’t decide if I should shoot it a furrowed eyebrow or an eye-roll, so I come dangerously close to executing both at once. I eventually elect to ignore the marketing and let the X5 M Competition speak for itself. The high-level specifications are a mixed bag. The X5 M, like the fourth-generation X5 on which it’s based, has grown bigger in all directions. This does wonders for cabin space, but its curb weight of 5,425 pounds is 165 pounds higher than before. The power-to-weight math, on the other hand, suggests that this year’s upgraded 4.4-liter twin-turbocharged V8 can deliver more than enough to offset the added mass. There are some promising chassis changes hidden underneath, but the only way to see if it...