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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.

Behind the scenes of BMW's 'Driftmob' [w/videos]

All this, for one minute and 47 seconds of action-packed footage with no official plot.
We arrive in Cape Town, South Africa, on the third and final practice day for the drivers of a BMWStories internet video called The Epic Driftmob feat. BMW M235i. We are immediately whisked to a large, empty parking lot on the outskirts of Cape Town, where tires are squealing and chunks of rubber are flying as five red BMW M235i coupes churn up more smoke than a California wildfire. And the smell - it smells like heated metal, the kind of thing rev limiters are made for. Times five.

This Or That: 1980 Oldsmobile 442 vs. 1989 BMW 635CSi [w/poll]

The last time I roped a coworker into an automotive debate, I lost. Resoundingly, I might add. Still, 2,385 voters chose to cast their lots for the Fiat 500 Abarth, as opposed to 5,273 choosing the Ford Fiesta ST, and so I can rest easy in the knowledge that at least 30 percent of you, dear readers, see things my way. I still like to think we have more fun, too.
My loss in the first round of our This or That series, in which two Autoblog editors pick sides on any given topic and then attempt to explain why the other is completely wrong, didn't stop me from picking another good-natured fight, this time with Senior Editor Seyth Miersma. Last time, our chosen sides were eerily similar in design, albeit quite different in actual execution. This time, our vehicular peculiarities couldn't seemingly fall any further from one another: A 1980 Oldsmobile 442 wouldn't seem to match up in comparison to a 1989 BMW 635CSi.
How did we come up with such disparate contenders? Simple, really. Seyth and I mutually agreed to choose a car that's currently for sale online. It had to be built and sold in the 1980s, and it had to be a coupe. The price cap was set at $10,000. The fruits of our searching labors will henceforth be disputed, with Seyth on the side of the Germans, and myself arguing in favor of the Rocket Olds. Am I setting myself up for another lopsided loss?