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  One of the most dominant manufacturers in sportscar racing in the last few years, Audi, heads this weekend to America's most storied sportscar race, the 12 Hours of Sebring. Promoting diesel technology with the debut of the new TDI-powered Audi R10 and with serious competition from rivals like Porsche, the 12-hour endurance race promises to be legendary  
           
 
 
           
     
 
 
       

 
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