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GM files plan for stock offering

General Motors Co., moving to unwind itself from government control, on Wednesday filed plans to go public and begin selling common shares as early as this fall. The filing--anticipated for weeks--came just 13 months after GM was restructured in bankruptcy with $50 billion in direct aid from the U.S. government.

2013 Porsche 911 GT3 Cup car teased in video

Porsche is teasing the 2013 Porsche 911 GT3 Cup race car on YouTube. It's the first dedicated track car of the 991 generation. The company reportedly will reveal the whole car to the public on Saturday.

A first look at the Audi TT RS plus

Audi is taking aim at the new Porsche Boxster and its yet-to-be-revealed sister model, the upcoming second-generation Cayman, with a spectacular 174-mph version of the TT RS, pictured here officially for the first time. Called the TT RS plus, the powered-up coupe and roadster pairing is set to join what is shaping up as a formidable display of new Audi models--including the third-generation A3 and the RS4 Avant--at the Geneva motor show in early March. The centerpiece of the new range-topping TT is a tuned version of Audi's turbocharged 2.5-liter, five-cylinder direct-injection gasoline engine as used by the go-fast TT RS, the RS3 Sportback and the limited-production A1 quattro.