Zips of savefiles you can download. You'll need to use a savefile editor to get the cd-keys to match. (The cd-key in the zip files is all zeroes).
Save file with Cop Z06 in career (with Silverton left to do if you want) and my cars:
LinkSave file with these cars (room for 2 more):
Audi Lemans Quattro
BMW M3 GTR
Koenigsegg CCX
Lamborghini Murcielago LP640
Pagani Zonda
Porsche GT3 RS
Chevorlet Corvette Z06
Dodge Viper SRT-10 (installed drift tires)
LinkSame as above but cars in black. BMW has no vinyl, and Audi has dark side panel.
LinkSavegame editor:
LinkLinkMirror for savegame editor in case above link don't work in the future:
LinkExtract the savegame editor into it's own folder. Run it and browse to:
\Documents and Settings\
\My Documents\NFS Carbon\ANFSC\ANFSC
then open your savegame directory and file. Mouse over the registration key and use -C to copy it, then click on the savegame key and use -V to paste it into the savegame key. Click on "fix", then "save changes", then exit the savegame editor.