Prior to the 2007 Daytona 500, for example, NASCAR driver Michael Waltrip and his team were heavily penalized when evidence of an unspecified oxygenate compound was found in the car's intake manifold during inspections.
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This exception was used during the 2007 Daytona 500, and during the 2009 Aaron's 499 when Carl Edwards' car went airborne into the catch fence off of Ryan Newman's car and came to a rest in the middle of the track as cars skirted to either side to cross the line.