Here is a link about Pontiac dropping its support for the grand prix from Nascar. Its goes on to say the following:

"Chevrolet will carry the NASCAR banner while Pontiac can now devote resources to developing future racing and marketing programs consistent with our new performance products, including the GTO, Grand Prix Comp G, G6 and the GXP performance series."

http://www.canadiandriver.com/news/031029-1.htm

 

That is an article about NASCAR, it says nothing about the G6 or GXP cars

 

yeah, not too much on the cars