Pink Floyd drummer owns one of the cars...
Here's Nick Mason driving his £1.5 million Ferrari in Cadwell Park in 2009.
http://www.thisisgrimsby.co.uk/video.html?id=43207
In the video he explains the car was in the movie as "part of an accident sequence that got out of control". He later bought and restored it.
The Amityville Horror Truth forum:
http://www.amityvillefaq.com/truthboard/