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One Lap of the Web: Mercedes-Benz SLC rendered, Google Glass for the Tesla S and a rusty Datsun 280ZX

We spend a lot of time on the Internet -- pretty much whenever we're not driving, writing about or working on cars. Since there's more out there than we'd ever be able to cover, here's our daily digest of car stuff on the Web you may not otherwise have heard about. -- Last month we brought you some intriguing spy photos of a Porsche 911-fighting Mercedes-Benz coupe -- possibly to be called the SLC, or even the next SLS AMG (it's all a bit unclear at this point) -- but layers of camouflage made it a bit tough to see what the car will look like.

2013 SRT Viper costs less than $100,000

We’ve had our first taste of the 2013 SRT Viper on-track at GingerMan Raceway in South Haven, Mich., which you can read about here. Now we know about how much it will cost to put the new V10 sports car in your garage. The SRT Viper starts at $99,390, which includes $1,995 for destination but doesn’t include a gas-guzzler tax that’s still being finalized.

Audi plans rival to BMW X6, design chief says

Audi will launch a rival to the BMW X6 and may add a challenger to the Bavarian automaker's X4, a top Volkswagen executive told Automotive News Europe. Walter de' Silva, design boss at Audi parent Volkswagen Group, confirmed that Audi has signed off on plans for the X6 rival. He declined to say when the car would arrive.