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Rennsport Reunion IV closes with Porsche 917s tearing around the track

Rennsport IV, three days of serious Porsche love at Mazda Racway Laguna Seca, concluded on Sunday with a half-dozen races around the picturesque track near Monterey, Calif. And while there were a variety of all things Porsche to see and hear through the three days, Sunday saw some of Porsche's most powerful race cars take to the track. It was certainly a case of saving the best for last.

Mercedes-Benz SLS AMG: The gullwing takes flight

Before we reveal what it is like to hot-lap a prototype version of Mercedes-Benz's 6.2-liter V8-powered SLS around the 2.2-mile Sachsenring in eastern Germany, let us tell you one thing that puts the big rear-wheel-drive coupe into clear perspective. The SLS, planned to get its first public outing at the Frankfurt motor show in September, is not based on any existing Mercedes model. Rather, it has been conceived, designed and engineered from the ground up in a no-compromise approach by the German carmaker's in-house tuning division, AMG.

Ferrari F450: Last one to be auctioned Sunday to benefit earthquake victims

In an auction featuring some of the rarest, fastest and most head-turning Ferraris ever, a brand-new F430 may be the show-stealer. The Prancing Horse said Wednesday that it is auctioning off the very last F430 to roll off the Maranello production lines at the end of the year to raise money to rebuild the central Italian region of Abruzzo, which was devastated by an earthquake on April 6. Ferrari will work with local authorities to distribute the funds.