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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.

BMW CS reinterpretation proves retro can be sexy [w/video]

Designer David Obendorfer doesn't work for BMW, but perhaps the German automaker should give him a call. His CS Vintage Concept shows a singular ability to understand the brand's classic style and reinterpret it for today. He isn't some amateur, either. Obendorfer has an industrial design degree and has been penning the interiors and exteriors of yachts from the Officina Italiana Design for five years, which counts luxury shipbuilders like Riva and Sanlorenzo among its clients. His website shows a real passion and knack for modernizing '60s and '70s European cars, too.
Obendorfer prefers to reimagine classic automotive styles. "Retro cars are not copies of their predecessors or renovated specimens, rather they are carefully studied reconsiderations, strongly rooted in contemporary style," he tells Autoblog. For the CS Vintage Concept, he worked to update the looks of the seminal BMW 2000CS and its E9 chassis while placing them on a modern platform. Obendorfer's inspiration comes from his belief that the later CS models' design is partially responsible for defining BMW styling, with its shark-nose front and four round headlights.
The CS Vintage Concept's shape starts with a jutting hood and a quartet of LED headlights, but the whole design really comes together in profile. The Hofmeister Kink at the rear pillar with the BMW Roundel is a nice nod to the originals, yet the proportions still find the perfect fusion of classic and modern. The interior is minimalist, with a vast expanse of wood for the dashboard at first glance, but the latter opens to expose the car's infotainment system.

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.