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Winners and Losers: Porsche sales pop in April

Porsche sales spiked 82 percent in April and are up 46 percent for the year, parking the luxury automaker among the top five winners so far for 2011. The redesigned Cayenne made the biggest contribution, with sales up an eye-popping 384 percent from last April and 141 percent for this year. Porsche counted 1,578 copies of the Cayenne sold in April, versus 326 the year before.

Motortrend examines making of Kia’s Track’ster concept

Motortrend has included a comprehensive step-by-step guide exploring the process through which Kia built its Track'ster concept car in its April edition. The study, complete with a detailed photo timeline, tracks the progress of the concept vehicle from the original idea right the way through to the car's unveiling at the Chicago Auto Show. The Track'ster was originally pitched as a turbo four-cylinder all-wheel-drive sports car and is based on the production version of the Kia Soul, which was the company's second-best-selling vehicle of 2011.

Fisker battles problems as the Karma finally lurches toward launch

All Henrik Fisker wants is to build his plug-in hybrid cars and deliver them to customers--some of whom have been waiting three years since plunking down $5,000 deposits. Instead, he has been fending off criticisms aimed at his green-car company as shipments of his $103,000 Karma plug-in hybrid sedan have been delayed by cash flow troubles, regulatory snarls and a recall. But when a startup such as Fisker Automotive accepts a Department of Energy loan in a down economy, having the company tossed around like a political football comes with the territory.