F40 in Northern Virginia

I know I probably should have posted this in the regional forum, however I know this gets more views, and I was wondering if it was a real F40 or just a replica(although if it was a replica it was the best replica I've ever seen). I saw the car in Herndon on Elden Street about 9AM this morning and wasn't really paying attention when something red caught my eye, and I looked up only to see an F40 go by. The only reason I have to believe this wasn't an real F40 is that the car seemed a bit short to me, but at the same time he was turning left and I didn't really have time to get a good look at it. I hope I see it again as an F40 is one of my favorite cars ever.