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Check out the trick way you access the tire valve on this BMW Alpina B6

The wheels are one of the first things you notice when checking out the 2015 BMW Alpina B6 xDrive Gran Coupe. The 20-inch aluminum alloy rollers have 21 spokes that spray out from their hubs, creating one of Alpina's signature design features. But there's also plenty of function to go along with the stylistic form of this hotted-up BMW 6 Series Gran Coupe.
By rotating the Alpina roundel and unlocking the center hub, you gain access to the tire valve and bolts, which are hidden inside. They're literally kept under lock and key, and they protect your Alpina's wheels from the elements and theft. This unique center-fill system employing a hollow spoke isn't a new setup for the favored BMW tuner, but since Autoblog had one in our offices this week, we thought we'd take the opportunity to show the unique mechanism in case you haven't seen it before. Check it out in our brief video below.

2013 Dinan S3 BMW 550i

Steve Dinan has been enhancing BMW models since 1979. But don't throw his company into the ring with the dozen or so other tuners who tweak, tinker and piggyback upgrades on the famed German marque. Dinan is a tuner, but it's also an engineering firm that writes its own software, builds its own parts and then backs everything it does with a factory-grade warranty. That sort of fastidiousness comes at a price, but most of its customers - including the powerhouse of BMW Motorsport - rely on Dinan to help them come out on top.
In stock form, BMW's 550i is a formidable four-door with a twin-turbocharged 4.4-liter V8 rated at 400 horsepower and 450 pound-feet of torque. While those figures allow it to run with quick company (0-60 in 5.0 seconds, according to the automaker), Dinan puts the sedan's kettle on full boil with its S3 package. Starting with the engine, the performance engineering firm bolts on larger turbochargers, air-to-water intercoolers, a trick strut tower brace cold air intake, a quad-pipe free flow exhaust and its own engine management software. Pump in some premium fuel, and the result is 542 horsepower and 587 pound-feet of torque. Power is sent through the stock eight-speed automatic to a limited slip rear differential (Dinan will upgrade xDrive all-wheel drive models, too).
The Dinan S3 also features and extensive suspension upgrade that includes new front camber arms and low compliance rear control arms (engineered to reduce understeer and improve turn-in). The stock dampers are retained, but new bump stops are installed along with new springs. Overall, the car rides about a half-inch lower than stock to improve roll rate. To reduce unsprung weight, forged 20-inch HRE Performance wheels are fitted at all four corners (wearing Michelin Pilot Super Sport tires - 275/35ZR20 up front and 295/35ZR20 in the rear). Lastly, the company remaps the factory Electronic Damper Control (EDC) software with its own Dinan Shockware to work in conjunction with the new enhancements.

BMW 2 Series Active Tourer is the world's first front-drive Bimmer [w/videos]

While BMW has been showing concepts for its Active Tourer for over a year, they never seemed entirely real. Why would BMW, a company that has built its image on sporty, rear-wheel drive sedans, move into the five-door, front-wheel-drive market? The answer is still not entirely clear, but the new BMW 2 Series Active Tourer is very real. It launches in Europe later this year and is rumored to come to the US in 2015.
To brand purists, a front-wheel drive BMW may seem anathema to everything the company has built, and the production Active Tourer has clearly been built to provide drivers with a luxurious but utilitarian package first and foremost. It is 170.9 inches long and rides on a 105.1-inch wheelbase, but despite its compact dimensions, its high roof allows for 16.53-cubic-feet of cargo space with the rear seats up or 53.33 cubic feet with them folded flat. Its general appearance is nearly identical to the previous concepts, except with a blunter nose and cleaner lines. The front end wears BMW's traditional dual circular headlights and naturally, while the profile incorporates the company's traditional Hofmeister kink into the greenhouse's rear pillar. The interior has been designed to be especially useful with a sliding rear seat, adjustable rear backrests, fold-flat backrests and optional features like an automatic tailgate and panoramic sunroof.
Unlike both previous concepts, none of the Active Tourer models at launch use hybrid power. For Europe, the hatchback is going on sale with three engine options. The basic version is the 218i Active Tourer with a 1.5-liter, turbocharged three-cylinder with 134 horsepower that we just previewed in the 2014 Mini Cooper - good enough for average fuel economy of 48 miles per gallon in the EU cycle when equipped with a six-speed manual. The next step up is the 225i Active Tourer with a 2.0-liter turbocharged four-cylinder that makes 228 hp and offers 39-mpg average fuel economy. Finally, there is the there is the 218d Active Tourer with its 148-hp, 2.0-liter turbodiesel and 57 mpg average fuel economy on the EU cycle. A six-speed manual is standard on all of them, but there is a six-speed automatic option for the 218i and eight-speed automatics available for the 225i and 218d. All-wheel drive will be available on future models.