Look in the 3rd party mods. It's old one... but it is a Caterham http://isiforums.net/f/downloads.php?do=download&downloadid=62
The rF Caterham was very good, that rF2 version... isn't. That's why Major Parts and others are working on a new version.
This old thread needs resuscitation because: https://www.youtube.com/watch?v=-whJd0sXrVc&feature=youtu.be and https://www.youtube.com/watch?v=sF9N7HAT3X4 and because it's Caterhams.