Perhaps someone can enlighten me on the "2005 Pontiac Firebird" as stated in the article. I think what they mean is the newest car was raced in 2005 as there was no such animal as a 2005 Firebird.
The newest car is a 2005 Pontiac Firebird raced by four-time Indianapolis 500 Champion Helio Castroneves. In November 2005, Castroneves drove the car to a fourth-place finish at Atlanta Motor Speedway in his final IROC start.