click above to view more high-res pics of the 2008 Chevy HHR

General Motors stepped up and sent a letter to the National Highway Traffic Safety Administration informing them of a defect with the Chevrolet HHR that could pose a head injury risk. After testing the retro-wagon back in December, it was discovered that vehicles not equipped with the optional "roof rail" airbags fail to meet the fed's crash standards. The recall affects 181,516 2006-2008 HHRs and Chevrolet dealers will begin installing an energy-absorbent piece of plastic to the headliner on all affected models next month.

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[Source: NHTSA]