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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.

M-fographic breaks down the history of BMW performance machinery

Few characters carry the kind of clout among performance enthusiasts as the letter M. For 35 years now, that one letter has adorned over 300,000 BMWs, each tuned to deliver a higher degree of performance than the stock models on which they're based.
The M division has worked up nearly 100 different models over the past third of a century, which can leave even the most expert among Bimmer fanatics bewildered. Fortunately British auto loan service Carfinance247 has commissioned this handy infographic to make sense of it all, and you can check it out below to see what the letter M really stands for.

2015 Morgan Aero 8 shows a host of upgrades to the Swiss crowds [w/video]

With over 1,250 units made, the Morgan Aero model line has been in production for 15 years – just a blink of an eye for the Morgan Motor Company. The automaker has been in business for over a century and has had a tendency to keep its vehicles in production for decades with frequent upgrades keeping them modern. At the Geneva Motor Show, the company is shaking up the range with a thorough revision for the 2015 Aero 8. Hidden beneath the vintage styling is an improved aluminum chassis with better torsional rigidity and an improved suspension setup. Power comes exclusively from a 4.8-liter V8 from BMW making 367 horsepower, and the Bavarian brand also supplies a new limited-slip differential to get power down at the rear. Buyers can choose between a six-speed manual and a six-speed automatic gearbox. At first glance, the latest Aero 8 bares all the hallmarks of Morgan's classic style with a long hood, prominent shoulders and short rear. The new version is exclusively available as a convertible, although, as these photos show, an optional hardtop is available. The aluminum body is also slightly altered with better aerodynamics up front, and the most obvious change comes at the rear where there's now a clamshell design. The interior also received a new, though still retro-looking dashboard design, and Morgan is touting its improved air conditioning system that reportedly works better in hot weather. Buyers wanting to eschew some of the supple leather inside can opt for a set of carbon seats, instead. With the introduction of the latest Aero 8, Morgan is ending production of both the Aero SuperSports and Coupe in April. Production of the new model then commences in the fourth quarter. Check it out on the Swiss show floor in the gallery above, and see the convertible in motion on some snowy British roads below. Introducing the new Morgan Aero 8 Over 1250 Aero platform cars delivered since 1st generation launch in 2000. New Aero 8 signifies return to soft top motoring within the current Aero range. Significant changes to the aluminium chassis, suspension and vehicle aerodynamics. Powered by a 4.8 litre V8 BMW engine producing 367bhp. Available with 6 speed manual or automatic transmission (with paddle shift). New Hand sculpted aluminium body and revised interior styling. Largest options list of any Morgan sports car to date. The Aero SuperSports and Coupe cease production in April 2015. Production begins during quarter 4 of this year.