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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.

2015 BMW Alpina B6 Gran Coupe challenges the M6 in New York

Despite being a well-respected outfit for decades, Alpina remains something of a mystery to many stateside BMW fans. In Europe, Alpina has established itself as a first-rate source for breathed-upon high-performance Bimmers, and it's looking to continue picking up traction on our shores. The US has received a handful of Alpina models through BMW factory channels, namely the 7-Series-based B7, and now we're getting another fast four-door with the debut of the BMW Alpina B6 xDrive Gran Coupe at today's 2014 New York Auto Show.
The B6 Gran Coupe stands as an interesting sibling to the factory's M6 Grand Coupe. Both are propelled by a 4.4-liter twin-turbo V8, but the tunes are quite different. The Alpina produces 540 horsepower and 540 pound-feet of torque, which is 20 hp less than the M6, but with 40 lb-ft more torque. An eight-speed automatic and all-wheel drive mean that the B6 is about half a second quicker to 60 miles per hour than BMW's own creation. Plus, the B6 has an unrestricted top speed of 198 mph, making it one seriously rapid 6 Series Gran Coupe.
The sport sedan also wears other Alpina goodies like 20-inch versions of the brand's 21-spoke wheels and exclusive color options. The B6 Gran Coupe goes for $118,225 (including destination), and will be available through BMW dealers immediately after the auto show ends. More info about the B6 is in the release below.

Two rare Alpina BMWs given the Petrolicious treatment

Alpina is getting more and more ink because of because of that rolling cannonade known as the B7 and its closer ties with BMW. The company's tuning business dates to 1962 when Burkard Bovensiepen began fiddling with Weber carburetors, then his company began racing in 1968 and was eventually certified as an automaker in 1983.
Two of its rarer specimens from those early years have gotten a glance from the folks at Petrolicious: the E24 B10 and E24 B7S. Based on the BMW 6 Series, the Alpina versions made one of the most special coupes from the Eighties even more so. According to the video, there were only 44 B10s made, and the turbocharged, 333-horsepower B7S - this was in a luxury coupe in 1982, mind you - saw only 33 examples produced.
You won't be sorry to find out more about them - and see how they run - in the Petrolicious video below.