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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 M4 Concept leaked ahead of Monterey debut

Last month, we heard that BMW might be bringing a concept previewing its next M4 sports coupe to this year's Monterey festivities. Well, thanks to the folks at USA Today, we have absolute confirmation of this by way of some leaked images. And goodness, she's certainly a looker.
While a few of us still find some of the 4 Series' design to be a bit awkward, it's hard to not immediately warm up to the aggressive bits of this hotter M4 concept. It certainly looks the business of a proper sports car, and a worthy successor to the M3 coupe. Of course, a lot of this will likely be toned down for the production version, which we'll likely be seeing at the 2014 Detroit Auto Show in January, along with its four-door M3 kin.
The official M4 Concept details will be revealed later tonight, but for now, have a look at a few shots of the golden show car in our gallery of leaked shots, above.

BMW i3 starts near $35,000; NA first deliveries January 2014

While in Germany at the first early pre-production drives of the hotly anticipated BMW i3, BMW people finally hinted at a price ballpark. Numbers being tossed around by pundits have actually been pretty close to what BMW is discussing internally - between $35,000 and just over $40,000. We have been assured now that the base price, should one choose to buy and not lease in the Euro zone, is just over 35,000 euro, with some big taxes included in that price. In the US, the starting price for the fully EV plug-in version should be $34,500 or right thereabouts. In addition to new pricing, we've also gotten our best-yet look at the i3, with the freshly uncovered spy shots you see here.
European deliveries begin in November of this year for the fully electric version of the rear-wheel-drive i3 with 168-horsepower and 184 pound-feet of torque. The e-motor mounted over the rear axle is supplied with energy by the 22-kWh lithium-ion battery pallet under the passenger compartment. Recharging happens in any of three ways: public or personal garage plug-in charge station (garage version not included in the price), the onboard system's Pro Eco mode that adds resistance to the drivetrain in a type of rolling brake energy recuperation, or through the normal brake energy and off-throttle coasting regeneration more common to EVs. Range on a full charge of this drivetrain is said to be upwards of 100 miles under hyper-miling conditions.
Perhaps the best bit of news is that the alternative, range-extending, two-cylinder 600cc engine supplied by BMW Motorrad for the hybrid version of the i3 - mounted in the rear together with the e-motor - will add only 2,000 euros in Europe and about $2,000 in the US. This is a range-doubling solution that could have brought a much higher price gouge, so thank you, BMW. The hybrid e-drive i3 version arrives a couple months after the full-EV launch version. Remember that, unlike the very similar system for the Chevrolet Volt, the system in the i3 supplies no mechanical torque to the driven axle and is only used as a generator (a system BMW first used last year in the 1 Series-based Active ). The US is seen as the clear number one market for the i3.