A Saudi prince twincharged his C32 a while back.... I forget where the article was from and don't have thte time to go hunting for it... I'll see if I can find it later.
Not sure what his final numbers were either, but the cost of the project was not worth the HP...but then again, what does he care, he's an oil prince.
EDIT: I opened the thread, and in fact we are talking about the same thing... article: http://autospeed.com/cms/article.html?&A=1447