Audi won Silverstone in '08 with a 2006 tub fitted with 2008 bodywork. And the ALMS cars from '08 were '07 or '06 cars with '08 body work. Teams do this all the time--I think that the newest Peugeot 908 is probably a year or two old.
As long as Audi doesn't change the tub design from year to year, they won't have a problem fielding updated cars--besides, the Audi R8 that won at Lime Rock in it's last race in '06 was built in January, 2002.
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