I was reading on www.autoweek.com and here is an article about a 600hp CTS-V.
http://www.autoweek.com/cat_content.mv?port_code=autoweek&cat_code=carnews&loc_code=index&content_code=09818491
http://www.autoweek.com/cat_content.mv?port_code=autoweek&cat_code=carnews&loc_code=index&content_code=09818491