2010 Porsche Cayenne V6 Silver/black W/ 31k Miles on 2040-cars

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Watch 1,208 Porsche 911s collect at Silverstone for world record

Porsche has been spending the majority of 2013 celebrating the 50th birthday of the 911, with its latest stunt taking the German brand to the home of British motorsports, Silverstone. To celebrate, Porsche invited enthusiasts to take their personal 911s on a lap of the former airfield, and boy, did the Porschephiles show up. 1,208 911s took part in the lap around the Grand Prix circuit, making it the largest-ever gathering of the iconic, rear-engined cars.
This wasn't just a celebration of 50 years for the 911, though. Funds raised were channeled towards Hope For Tomorrow, a cancer charity that works with the United Kingdom's National Health Service in operating mobile chemothereapy units that make life just a little bit easier on cancer patients.
Take a look at the long video below, and enjoy the passing of what are likely examples of every 911 model ever built.

Porsche bringing Macan S Diesel to US instead of 4-cylinder [w/poll]

When Porsche unveiled the new Macan at the LA Auto Show, it announced two powerplants for the US market, both of them twin-turbo V6s: the Macan S equipped with 340 horsepower from its 3.0-liter engine, and the Macan Turbo with 400 horses from 3.6 liters. But those aren't the only engines Porsche will offer in its new compact crossover. Porsche is also offering the Macan S Diesel overseas with 258 hp, and reports have since indicated that a pair of four-cylinder models on their way: a 2.0-liter turbo four with 280 hp and four-pot turbodiesel of the same capacity with an as-yet undisclosed output.
Now Car and Driver is reporting that while those four-cylinder engines won't be making the transatlantic voyage to our shores, Porsche will offer the aforementioned Macan S Diesel in North America beginning in early 2015, nearly a year after the gas V6 versions arrive.
The 3.0-liter turbodiesel V6 is based on the same engine found in the Cayenne Diesel and the Audi Q5 TDI on which the Macan is based. Of course, its 248 hp is substantially less than the 340 ponies in the Macan S, but its 413 pound-feet of torque outshines not only the 339 lb-ft in the Macan S but also the 406 lb-ft in the Macan Turbo. Acceleration times, however, suggest the Macan S Diesel is still slower, with a 6.3-second run to 62 mph than neither the Macan S (5.4 sec) or Macan Turbo (4.8). The good news is that the Macan S Diesel is tipped to undercut the price of both, dropping the oil-burning crossover's MSRP below that of the $49,900 starting price for the Macan S and the $49,600 for the base Cayenne. If that C/D prediction comes to pass, that will make it the Macan S Diesel most affordable Porsche sold.

Jay Leno puts carbon fiber wheels to the test on a Porsche 911 GT3 RS

Jay Leno's Garage usually focuses on looking at cars new and old, speaking to their owners and then Jay taking a drive to see what he thinks. However, Leno throws his usual shtick to the curb this week to do a full product test of the carbon fiber wheels from a company called Carbon Revolution. If you're not interested in hearing about wheels for 18 minutes, don't worry. They get mounted on a Porsche and are tested back-to-back with stock wheels, and Leno takes the 911 for a track test, too.
While carbon-fiber wheels aren't exactly a new idea, Carbon Revolution's goal is to create a lightweight, one-piece product that can be mass produced. The company even claims that it already has a deal with an OEM automaker to offer them on a vehicle in a few years. The key to the technology is that it doesn't need an expensive autoclave to be made.
In the meantime, the company's carbon fiber wheels are available as an aftermarket option for about $15,000 a set, according to the video. They weigh in at about 15.5 pounds each and offer OEM-levels of stiffness, so they could cut some unsprung mass off of a performance car. Watch here as Jay and his mechanic Bernard lap Willow Springs and give their feedback about what they think of this cutting-edge technology.