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Mercedes-Benz Concept IAA is a modern silver aero

While we English-speaking folk call it the Frankfurt Motor Show, our German friends call this week's bi-annual confab the Internationale Automobil-Ausstellung, or IAA. At first glance, then, you might think Mercedes-Benz named its Frankfurt concept, the Concept IAA, after the show it'd debut at. But, the Concept IAA isn't named for the show. It's actually an abbreviation for Intelligent Aerodynamic Automobile, and it's very aerodynamic indeed. This four-door coupe can transform, while moving, from its sedan-like design mode to an ultra-sleek, gas-powered fish of a car. This aerodynamic mode has a drag coefficent of just 0.19. That's sleeker than a Tesla Model S, and it ties the rating of the General Motors EV1 electric car. In fact, it's very nearly as aerodynamic as the Volkswagen XL1. The IAA can transform automatically at 80 kilometers per hour (about 50 miles per hour) or via the press of a button. When it enters an aerodynamic mode, eight segments at the back of the car extend out, adding over 15 inches to the overall vehicle length, effectively extending its already tear-dropped-shaped tail. And that's just the most visible aero aid. At the front of the car, flaps in the bumper extend out nearly an inch, while there's a smaller extender in the back bumper. These serve to keep air away from the wheel arches, where turbulence can become an issue. Of course, Mercedes has thought of this, too, fitting "Active Rims" that "alter their cupping from 55 mm to zero," whatever that means. There's even an active aero aid inside the front bumper, where a louver extends backward by 2.3 inches to smooth out the air traveling underneath the car. Outside of its super-slippery mode, the IAA is a relatively handsome four-door coupe, featuring the kind of plunging roofline that wouldn't look out of place on the company's pioneering CLS-Class. The interior is certainly worthy of the CLS, too. It's home to gorgeous white leather and touch-based controls, and in general, looks very luxurious. Mercedes' dogged pursuit of aerodynamics does not mean that the Concept IAA is some gutless ecomobile. Under the skin is a gas-powered, plug-in hybrid system that produces up to 279 horsepower and allows the sleek sedan to hit 155 mph. Its all-electric range is based, of course, on what mode its body is in. It's most impressive in aero mode, where it will cover 41 miles on a single charge. Switch over to design mode, and that figure drops slightly to 38.5 miles.

2017 Mercedes-AMG C63 Coupe looks quick, mean

The latest Mercedes-Benz C-Class Coupe isn't even on the road yet. Still, the folks at AMG are already working at tweaking the two-door into a future high-performance variant as the natural challenger for the BMW M4. While this model is heavily camouflaged all the way around, an aggressive face akin to the C63 sedan is already pretty easy to spot. Both cars feature air dams with big openings to feed cool air to the 4.0-liter, twin-turbo V8 under the hood. Compared to the previously spied, standard version of the two-door C-Class, the AMG looks to feature wider front fenders, too. Despite the concealment, other visible high-performance touches include lower side sills and larger brakes peeking out behind the wheels. Of course, the four exhaust pipes sticking out the back are a big giveaway of the coupe's intended high-speed purpose, too. Like the C63 sedan, expect a choice of tunes of the V8 to be available with either 469 horsepower or the more powerful S with 503 hp. The wait to see the two-door without all of this camo shouldn't be too long, either. An earlier report suggests that both the standard coupe and AMG versions could debut at the upcoming Frankfurt Motor Show in September. Related Video:

Mercedes-AMG previews new C63 Coupe ahead of August 19 reveal

Mercedes has been spending the month of July preparing us all of the debut of the new AMG-fettled C-Class coupe. It dropped an enigmatic teaser video on us at the beginning of the month, followed by a handful of teaser images, and another video after that. Now it's released another batch of images to give us a taste of what to expect. These prototype pictured is still heavily camouflaged, so there's little more to tell from them than we already saw from the spy shots we brought you back in April. We can see the front end a bit better, bearing what looks like the same lower air dam as the C63 sedan, but everything save for the front part of the greenhouse is covered up in the swirly stuff. While the photos posted on the Mercedes-Benz Facebook page refer to this as the C63 Coupe, the AMG post references the Mercedes-AMG C-Class Coupe. Either way, we're expecting it to pack the same 4.0-liter twin-turbo V8 as the sedan (as well as the AMG GT), likely to be made available once again in 469- and 503-horsepower states of tune. Affalterbach has also posted a countdown timer on its website, with 23 days left to go until the new muscle coupe makes its debut. So mark your calendars for August 19, and watch this space for more as the German automaker is sure to keep trickling out more photos, videos, and information between now and then. Related Video: