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Vorsteiner BMW M4 GTRS4 shows how to do a widebody at SEMA

Part of the joy of the SEMA Show is that all of the best tuners in the world are competing to show off their wares, and the challenge often pushes the companies into some absolutely insane directions. Case in point: Vorsteiner and its ludicrous GTRS4 wide body kit with the BMW M4.
According to Auto Evolution, the kit reportedly adds 4 inches in the front to fit 10.5-inch-wide wheels and a massive 7-inches more in the rear to snug in 13.5-inch-wide wheels, but spinning around the BMW in these images makes the changes look even more extreme. Beyond just the extra room in the fenders, the lower air intakes are ready to suck in huge volumes of cool air, and there's a front splitter to keep things planted. The front and rear extensions are joined by side sills that grow the farther back they go. Finally, at the rear, the M4 gets a reworked diffuser with mesh inserts.
This is just the type of automotive craziness that makes SEMA interesting. Take a lot at it for yourself in the gallery.

2015 BMW X6 keeps it weird

Say what you will about the BMW X6 - odd and ugly as it may be, it's actually been sort of successful for the German automaker. BMW has now sold some 250,000 examples of the X6 since its launch, and the company's fastback-crossover-coupe-whatever-thing gets a host of meaningful updates for the 2015 model year while not straying from its original mission.
Aside from its revised styling, most noticeably set apart by its larger, X5-inspired headlamps, the biggest update for the US-spec X6 is the addition of a rear-wheel-drive model, the sDrive35i. This trim joins the all-wheel-drive xDrive35i and xDrive50i, and since you should all be capable of decoding BMW's weird naming structure by now, you know this means the X6 will be offered with a choice of 3.0-liter turbocharged six-cylinder and twin-turbo 4.4-liter V8 engines. Fuel economy figures have not been released yet, but BMW says the new powertrains are more efficient than before, mated exclusively to an eight-speed automatic transmission regardless of cylinder count.
Look for the updated X6 to hit US showrooms this fall, following its debut this week in Paris. Expect pricing to be revealed closer to the model's on-sale date. Have a look below for all of the details.

Alpina D3 Bi-Turbo torquing its way toward Frankfurt

Few tuners benefit from the kind of factory support that Alpina does, giving the pseudo-aftermarket firm nearly as much official status as BMW's own M division. And this is its latest product.
Set to debut, as expected, at the Frankfurt Motor Show this week is the new Alpina D3 Bi-Turbo, which you can consider, for all intents and purposes, the diesel M3 that BMW never built. While the outgoing D3 (which was Alpina's best-selling model) used a four-cylinder engine, Autocar reports that the new model packs a 3.0-liter, twin-turbo inline-six diesel to drive a respectable 345 horsepower but a mammoth 516 pound-feet of torque to either the rear wheels or all four through the optional availability of xDrive. (European buyers will also be able to choose between sedan and wagon bodystyles.)
The engine is the same as you'd find in the XD3 and D5 (Alpina's diesel performance versions of the X3 and 5 Series, respectively), but in the lighter 3 Series form can propel the D3 Bi-Turbo up to 62 miles per hour in 4.6 seconds and on to an Autobahn-crunching top speed of 173 mph. And as per Alpina tradition, visual cues are minimal, with a subtly optimized aero kit and 19- or available 20-inch alloy wheels. Unfortunately, the 7 Series-based B7 is the only Alpina we get on this side of the Atlantic, but an oil-drenched performance enthusiast can dream.