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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 X4 M40i caught production-ready

It seems like BMW is pretty committed to this whole X4 thing. Aside from the current xDrive28i and xDrive35i, we've captured a round of spy photos showing what our spy shooters tell us is a more dynamic M40i model.
The higher-performance hunchback follows in the footsteps of BMW's other sub-M cars like the M235i. In fact, much like the high-po 2 Series, the M40i is expected to make use of a 3.0-liter, turbocharged six-cylinder, developing 365 to 375 horsepower.
Aside from that, the rest of the X4 M40i fits the brief of other near-M models, with a more aggressive body kit, larger wheels, firmer suspension and brawnier brakes. Expect some mild tweaks inside, too, including sportier seats and an M-specific steering wheel.

Totally uncovered BMW M3 caught by helmet cam

Sure, we've seen - and even ridden in - the 2015 BMW M3 before, but always under the cover of camouflage. Proving that it's always nice to be in the right place at the right time, a motorcyclist managed to capture a completely undisguised 2015 M3 (codenamed F80) on video during a closed-road photo shoot.
Road & Track has the helmet cam video, which shows the bright blue M3 doing a three-point turn as it follows a camera car possibly for an upcoming commercial or launch video. While the images are grainy, we do get to see some of the styling details for the next-gen M3. Aside from the extra set of doors, this M3 looks a lot like the Concept M4 Coupe we met a few months ago, including the bulging hood, oddly shaped door mirrors and the wide, vented front fenders. The aggressive fascia, big wheels/low-profile tires and quad exhaust outlets all but confirm this is the production M3 we'll be seeing at the Detroit Auto Show in a couple of months.
We've put together a gallery using screen shots from the video, but check out the video posted below to see the new M3 in motion.