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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.

2016 X6 M brings the power at LA show

BMW tore the cover off the second generation 2016 X6 M Wednesday at the Los Angeles Auto Show.
BMW tuned the 4.4-liter twin-turbo V8 to push out 567 horsepower, up from the last model's 555 hp. Torque also leaps to 553 pound feet, compared with the previous output of 500 lb-ft. The V8 is paired with an eight-speed automatic transmission, which swaps in for the old six-speed. This potent powertrain allows the crossover to hit 60 miles per hour in about four seconds.
The X6, which features slightly more dramatic styling and an angled rear roofline, debuted alongside the more conventionally styled 2016 BMW X5 M at the LA show.

2015 BMW X6

Most everyone would agree that BMW offers a range of very attractive and well-proportioned coupes, sedans, crossovers and wagons. Yet there is one member of its family that has always struck us as a bit odd: the X6.
Proudly coined "The world's first Sports Activity Coupe" by its German maker, the X6 features a wedge-shaped body with a characteristic sloping roofline that appears to squash the heads of its second-row occupants. The crossover rides high off the ground, with a pronounced gap between its chassis and oversized wheel/tire package, capped by short overhangs on both ends. Although curious to the eyes, its overall styling is masculine, and its stance aggressive.
Whether you consider the X6 to be attractive or an eyesore - opinions seem about equally divided - there is nobody at BMW questioning its business model. As of today, the automaker has sold more than 260,000 copies of its five-door crossover, which is why it has flown us to Spartanburg, SC, to sample its second-generation 2015 BMW X6.