"This jewel's unofficially referred to as the Ferrari F40 Barchetta. But is it actually a Ferrari? You may be surprised.
We assumed this Ferrari F40 was a fauxrrari at first, but with further digging we realized that this was in fact, a bonafide, true-to-life Ferrari F40 based on an ex-IMSA GTcar. Let's find out more on the story, shall we?"
An interesting read with plenty more photo's if you're a sadist
Source