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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.

X4 launch to spearhead BMW crossover onslaught at NY Auto Show

It's no secret that crossovers are one of the key vehicle types driving today's auto industry profits, and nowhere is that more true than among the world's luxury brands. BMW became one of the first players in the luxury CUV segment when it launched its original X5 in 1999, and buoyed by that model's runaway success, it followed up with the X3 in 2003, the X6 in 2008 and the X1 in 2009 (though the latter didn't make it to the US until late 2012). It's replaced the X5 twice since then and the X3 once, but the Bavarian automaker isn't about to let matters rest there.
First off, a production version of a new X4 model is expected at the New York Auto Show in April. The model was previously rumored to be earmarked for reveal a month earlier, but a new report from Autocar suggests that the previously mooted reveal date and location were inaccurate. The X4 is expected to apply the same controversial slant-back formula to the X3 that transformed the X5 into the X6, which will in turn lead to an update for the X3 as well.
But that's not all. Autocar also reports that before 2014 is out, BMW will unveil a revised X6 at the Moscow Motor Show in August, which will in turn be followed by upgraded versions of both the X6 M and X5 M. These high-performance crossovers are tipped to pack the same 4.4-liter twin-turbo V8 as the outgoing versions, albeit with higher outputs than the current models' 555 horsepower and 500 pound-feet of torque. All this, and they're still expected to simultaneously improve fuel consumption and emissions figures.

BMW X4 Concept images leak ahead of Shanghai debut

Last month, BMW confirmed that its long-awaited X4 crossover would debut next year, but other than imagining a smaller X6-shaped crossover, we really had no idea what the new niche model would look like. That is until a Russian website, Autowp, leaked a handful of embargoed images this morning showing the X4 Concept that will be unveiled in a couple of weeks at the Shanghai Motor Show.
From what we can see of this concept's styling, there are more elements shared with current BMW models than not. The face of the concept is an attractive blend of the current 3 Series sedan and the X3, while the roofline has definitely plucked right from the X6. This thinly veiled concept should carry over almost untouched when it enters production with the exception of the door handles and the overly stylized fascias and side mirrors. According to CarScoops, it will measure the same length as the current X3 and use the same engine lineup as well. Stay tuned, as we'll have more information on this concept shortly.