Those guys who modified thier cars are stupid because there already are aftermarket body kits that look much better. Just look at this one at:
http://www.rksport.com/main/catalog_detail.asp?mdid=21&catid=4&appid=328

That version looks much better than the stock and is allot cheaper than adding Ferrari and Porsche parts to their Solstice.
This new GXP will also be featured as one of the many cars in the new upcoming Transformers Movie. It has a hradtop that was custom made for the movie and as of now is still not availible to the public.