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BMW X4 Concept is no Shanghai surprise

"One in four new BMW cars is now a BMW SAV." If you're new to BMW parlance, SAV stands for Sports Activity Vehicle, a vehicle type most of us more commonly refer to as a crossover, and that statistic, which comes straight from the automaker itself, tells you all you need to know about why the X4 Concept you see above exists.
Like its larger X6 sibling, the BMW X4 Concept tries to shove a crossover in a mold shaped vaguely like a fastback coupe. Put another way, the X4 is likely to be a polarizing design, though perhaps not to the extent that the X6 divided opinions. As for us, we definitely prefer the styling of this X4 Concept, with its strong character lines and impressive wheel-to-bodyside ratio, over that of its bigger brother. That said, we're sure the AMC Eagle comparisons will begin in earnest starting right about... now.
Dimensionally, it seems the most obvious machine with which to compare this X4 Concept is the 3 Series Wagon - we're not sure if it will be as spacious inside as the 3 Series Gran Turismo. A two-inch stretch in the wheelbase ought to bring a commensurate improvement in legroom, and a body that's nearly five inches longer should be a boon for cargo capacity. Of course, that fastback roofline will surely cut down on the car's roominess inside, but we'll have to wait for the final production model to judge its true capabilities.

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.

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Discussion Topics for Autoblog Podcast Episode #334
2014 Mercedes Benz S Class