How exactly do you convert NFS4 cars to NFS3? I have VIVwizard and CarCAD to edit my NFS3 cars, but I don't know how to edit NFS4 cars.

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'97 HP 8160 (233mhz P1)
Sony CD-RW
Sony DVD
128MB EDO RAM
SB 512 PCI
Voodoo 3 PCI 2000
Internal ZIP