With 617 horsepower and a 208mph top speed, topping the Mercedes SLR McLaren was no mean feat. Mercedes nearly managed to pull it off with the new SLS AMG. The gull-winged supercar was unveiled at the recent international auto show in Frankfurt to rave reviews. But it still falls a shade short of its predecessor's bragging rights, so the German automaker is reportedly working on an even more exclusive, more powerful and more capable SLS AMG Black Series.

Following in the Black Series that has given us the SLK55, CLK63 and SL65, the SLS Black is expected to gain some extra power and lose some weight to optimize that vital power to weight ratio. Sources expect the 563hp and 479lb-ft of torque from the existing 6.2-liter V8 to get a boost past the 600hp/500lb-ft mark, coupled with a 50kg weight-shaving scheme to drop the "stock" SLS' 0-62 mph time down from 3.8 seconds – already faster than 99% of the cars out on the road – to below 3.5 seconds, and the top speed up from 195 mph to 208.

Of course the added exclusivity won't come cheap: insiders expect the price to jump by half to over $250,000 when the SLS AMG Black Series hits the market in 2013.

Even in this slowing economy, Zondas have been trading well over list, some even doubling their value as wealthy customers scramble to get their hands on one. So you can hardly blame Pagani, the Italian exotic automaker responsible for these imminently desirable supercars, for wanting to get in on the action. In fact we're thankful for it, as Pagani has released another very exclusive edition of the Zonda.

Following on the heels of the fixed-roof Zonda Cinque, which went so fast that one customer commissioned his own when he couldn't get one, the Zonda Cinque Roadster offers the same extreme performance and super-exclusive stature with the added bonus of wind in your hair. Because the Zonda's carbon fiber body is already so rigid, Pagani didn't have to add much extra reinforcement, leaving the Zonda Cinque Roadster capable of reaching a follicle-tingling 217 miles per hour, passing 60 on the way in just 3.4 seconds. Nice work if you can get it, but with only five examples on offer and a £1.1 million ($1.8M) asking price, you'll have to act fast to get one. Like, Zonda fast.

It's a sign of the times if we've ever seen one that Mercedes has chosen to debut its new flagship sedans at the Shanghai motor show this year. The German automaker has given the top-of-the-line S-Class a mild update for the 2010 model year, and has just released details and photos of the pair of AMG-tuned sport models at the peak of the range.

Like the rest of the line-up, the S63 AMG and S65 AMG get a new grille, LED lighting, revised front bumper and rear bumper with an integrated diffuser to help it stay glued to the road on those de-restricted Autobahns. The interior has likewise been updated, incorporating the full array of electronic systems to make driving these muscular luxury sedans a breeze. But it's under the hood where these two behemoths really shine: the S63 packs a 525-horsepower V8, while the S65's party piece is a twin-turbocharged V12 with over 600 horsepower. Both are aided by Mercedes' latest torque vectoring system to help get the giants around the corner. Although this is probably the last concern of someone buying a machine like either of these, but emissions and fuel consumption have been improved on both models by a meager 3%. Pricing has not yet been announced, but the previous models which these replace sold for approximately $130,000 and $200,000 respectively, so expect similar pricing on the 2010 versions, which you can view in the pair of image galleries below.