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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.

BMW M2 to pack 365 hp

The BMW M2 was spied testing several times last summer, but there has been little news about the upcoming entry to the M family as of late. More info is finally leaking out though, and it potentially confirms some past reports, while giving a better idea of what the coupe looks like. We have to take any of these leaks with a grain of salt, but according to a user on the 2addicts forum citing insider sources at BMW headquarters, M2 production begins in November. This person also reiterates that the coupe uses BMW's N55 turbocharged 3.0-liter inline-six. In this tune, it would reportedly make 365 horsepower and 343 pound-feet of torque. Plus, an over-boost system would allegedly push twist by about 25 lb-ft at low revs. At launch, this rumor also suggests that BMW might keep the M2's color palette limited to just four choices: Alpine White, Black Sapphire Metallic, Long Beach Blue Metallic and Mineral Grey Metallic. Inside, there're purportedly even fewer hues with the only one being black with blue stitching. Assuming these numbers are accurate, the M2 seems to represent a decent upgrade over the already capable M235i. It also uses a version of the N55 but a version making 320 hp and 330 lb-ft. In addition to the extra grunt, previous spy shots show the M with a front fascia akin to the M3/M4.

The next-generation BMW M5 starts here

The next-generation BMW 5 Series hasn't even arrived yet, but BMW is hard at work testing the hottest version of the popular sedan – the sixth-generation M5. Now admittedly, these photos might not look much like an M5. The wheels are big, but not uncommonly so. There's no wild and crazy body kit, or hugely flared wheel arches. But what's that in the back? Are those four exhaust tips? Why yes, yes they are. And take a second look at those wheels. Notice the pizza-pan-sized brakes and huge calipers? Yet another M5 giveaway. But as our spies rightly point out, even though this does represent development work on the next M5, it's a very early prototype. That could also explain the charge port on the driver's side front fender, a feature that we've seen on other 5 Series prototypes. This does not mean the next M5 will be a plug-in hybrid, however. What the next M5 will likely be, though, is all-wheel drive. This isn't a huge surprise, considering that the Mercedes-Benz E63 AMG has already gone AWD, while the Porsche Panamera Turbo and Audi RS6/7 have always had four driven wheels. BMW has even hinted at just such a development, with former M boss Dr. Friedrich Nitschke going as far as saying AWD could arrive on the next M5. "On our cars we are thinking of all-wheel drive, but it won't come before we get the successor of the M5 and M6," Nitschke said in an October 2013 report. "That's the timing and it's not practical to react in the current life cycles." At this point, it's simply too early to guess at when or where the next-generation M5 will debut. We're expecting the next-gen 5 Series at either the 2016 Geneva Motor Show or Auto China 2016 in Beijing. The next M5 could join it, although it's possible it'd get its very own debut at a later date.