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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.

Alpina B3 Bi-Turbo offers Europeans a pre-M3 performance 3er

Anyone that's spent some time behind the wheel of the Alpina B7 probably knows enough to understand what Americans are missing with this, newly launched Alpina B3 Bi-Turbo. We've got no lack of M models to choose from, it's true, but the Alpina touch offers a completely different driving character, with almost as much performance. A pity then that Alpina has no plans that we've heard of to bring this one across the pond.
Filling the gap between the current 3 Series offerings and the outgoing M3 (we're not likely to even see the new M3 and M4 until September's Frankfurt show, nor be able to buy one until after that), the B3 Bi-Turbo brings serious performance to the F30 3er. As the name indicates, two turbochargers are used to force-feed BMW's 3.0-liter inline-six engine, for a total output of 410 horsepower and 442 pound-feet of torque. That power offers a big jump from even the BMW 335i sedan, and will push the B3 to 62 miles per hour in just 4.2 seconds and on to a top speed of 190 miles per hour. Alpina's own sport suspension underpins the thing, while the power is modulated by way of a eight-speed automatic transmission.
The new B3 will be easily recognizable thanks to its "Classic" 20-inch, 20-spoke Alpina wheels, and a rather subtle, aero-enhancing body kit. No pricing has yet been announced, but you will find a host of additional information in the attached Alpina press release below.

BMW recalling 1 Series ActiveE over bad drivetrain housing

There are always growing pains when automakers introduce new technologies. BMW is learning this with the electric powetrain used on the 2011 BMW ActiveE. According to the National Highway Traffic Safety Administration, about half of the all-electric 1 Series coupes currently in the hands of the public are being recalled for a potential problem that could leave the cars stranded.
With 700 ActiveE models running around the US, 360 of these cars have insufficient sealing between the electric motor and transmission, which could lead to premature wear to the connection between the two, which in turn could result in a loss of propulsion. BMW started notifying affected owners by phone earlier this month.
While no automaker wants a recall on its hands, it's much better for BMW to learn such a lesson now on the low-production, lease-only ActiveE ahead of the car's successor, the BMW i3, which is expected to be a much higher-volume EV. Scroll down for the official recall notification.