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Porsche Panamera explained in greater detail

Porsche has revealed previously undisclosed details of its new Panamera ahead of a planned public debut at next month's Shanghai motor show. On sale in North America on Oct. 17, the first-ever Porsche sedan will cost more than the BMW M5 and the Mercedes-Benz CLS63 AMG, with prices starting at $89,800 for the base rear-wheel-drive Panamera S and rising to $93,800 for the four-wheel-drive Panamera 4S.

Lajdziak replaces Schembri as the president of Smart USA

Jill Lajdziak, Saturn's former top executive, was named president of Smart USA just three days after starting with the company. David Schembri, who previously held the job, will take an unidentified position with the Penske Automotive Group, which distributes the Smart ForTwo microcar in the United States, the company said. "Dave will transition into retail operations at Penske Automotive Group with our dealerships," said Penske spokesman Anthony Pordon.

Dinan S3 boosts BMW 550i to M5 levels

Dinan introduced the 2013 BMW 550i S3 on Tuesday. The tuner upgrades the already quick sedan to 542 hp, but claims to retain enough refinement to be a daily driver. The upgrade is also factory backed for four years or 50,000 miles by Dinan's nationwide network of service centers.