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2015 BMW X4

BMW has been in the line-blurring business of late, with the original X5 "Sports Activity Vehicle" muddling the line between SUVs and sport sedans in 1999, the 5 Series Gran Turismo challenging what our definition of "Gran Turismo" means in 2009, and pretty, low-roofed four-doors like the 6 Series Gran Coupe and the fresh new 4 Series Gran Coupe broadening the meaning of the word "coupe."
In the midst of all of this, BMW blurred the lines around both the SUV and coupe genres with its big, heavy, and in many ways ridiculous X5-based "Sports Activity Coupe" (cue collective eye-roll), dubbed X6. Auto wags scoffed at its lack of utility, compromised outward visibility and added cost, but a more emotional public was apparently smitten enough by its aggressive looks to avail itself of some 250,000 of them worldwide in six model years on sale.
Enter the all-new 2015 X4 crossover - err, "Sports Activity Coupe" - which BMW hopes will perform as well in the compact category as the X6 has on the next rung up the ladder. Like the X6, the X4 is a tough sell on paper: it's more expensive and less practical than the X3 on which it's based; it's heavier, despite the loss of interior space; and it doesn't even hold as much stuff in the back as the 3 Series wagon. As with the X6, the X4 is essentially a high-riding style statement that, like proper coupes (the two-door kind), says to the world, "You fools can take your need for practicality and shove it. I just want to look good."

BMW rethinks all-wheel-drive M cars

BMW M hasn't been able to decide whether it wants to jump on the all-wheel-drive bandwagon or not (with the exceptions of the X5 M and the X6 M, which are based on AWD architecture). That might be changing though, since M's president Friedrich Nitschke recently realized that 70 to 80 percent of Mercedes-Benz E63 AMGs are ordered with all-wheel drive. Earlier this year, Nitschke said that there were no new AWD M models planned, so this comes as somewhat of a surprise.
"On our cars we are thinking of all-wheel drive, but it won't come before we get the successor of the M5 and M6," Nitschke said in a Motoring report. "That's the timing and it's not practical to react in the current life cycles."
"On our cars we are thinking of all-wheel drive." - Friedrich Nitschke, BMW

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.