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Aero testing pays off big for Cup teams

Updated: November 8, 2011, 1:19 PM ET
By David Newton

INDIANAPOLIS -- In a rather nondescript building at the end of a side road about 10 minutes from Indianapolis Motor Speedway amid a bunch of other nondescript buildings, there's a stock car about the size of a go-kart going through a wind-tunnel test.

The car is owned by Earnhardt Ganassi Racing. It has a No. 1 on the right side and No. 42 on the left, but there is no miniature Jamie McMurray or Juan Pablo inside. I looked just to make sure.

But what goes on in this ...

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