I have a bunch of NFS4 cars that I'd like to convert to NFS3. How can I do this?? I currently use CarCAD and VIVwizard to edit all of my NFS3 cars, but I don't know how to convert them. Thanks in advance.

'97 HP 8160 (233mhz P1)
Sony CD-RW
Sony DVD
SB 512 PCI
Voodoo 3 PCI 2000
Internal ZIP