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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.

2013 Nissan GT-R and 2013 Alpina B6 mix it up on track and street

Here we have Autocar making an unforeseen comparison: the Nissan GT-R against the Alpina B6 at Brands Hatch and on public roads. Steve Sutcliffe clobbers the circuit in the 3,828-pound, all-wheel-drive sports car, then sees how well the 4,114-pound, rear-wheel drive grand tourer does against it.
Sutcliffe says there are quite a few similarities between the two cars, but that's really only on the spec sheet. The Nissan's got two turbos attached to its 3.8-liter V6, 542 horsepower and 465 pound-feet of torque. The Alpina's got two turbos attached to its 4.4-liter V8, 532 hp and 528 lb-ft. But one's brief is to be a monster on the track, the other on the boulevard, and if there's anything the video demonstrates, it's each car's focus.

Is BMW the only real competition to Tesla Motors?

Tesla Motors chief Elon Musk probably isn't losing a ton of sleep over the new plug-in efforts by the makers of the "Ultimate Driving Machine," but maybe he should. That's what the Motley Fool is saying, presenting the case that the California company's real competition will come from BMW. What about the plug-in efforts of General Motors or Ford? Musk can hit the snooze, Motley Fool says. Unlike automakers that are "jamming battery packs into the existing vehicle design," BMW has built its i3 battery-electric and i8 plug-in hybrid supercar from the ground up. Like Tesla, BMW puts its battery packs into the floor of its vehicles. Most importantly, the i3 - and especially the i8 - are real performers. While the i8 is about 40-percent more expensive than the Tesla, it matches the Model S's 0-60 mile per hour acceleration times and handily beats its top speed figures. Tesla sold about 6,900 vehicles during the last three months of 2013 and BMW had more than 10,000 i3 orders on the books by late November and the first year's allotment of i8s is already sold out. The German automaker has what the Fool calls an "outside chance" of selling more plug-in vehicles than Tesla by next year, but Tesla is gearing up its gigafactory to get ready to sell a half-million EVs in 2020, so the race is most certainly on. You can read more over on the Fool.