There is a DOS program that will allow you to replace cars and with some
hand editing to a txt file you can change the drivers name and ranking/ai.
Its a bit more cumbersome than N3 but www.high-compression.com has also
created an EXE installer that replaces all 43 cars with the real WC
counterparts. Its simple to install and puts NH in a league above N3. The
same site has an IROC installer and is working on trucks.