You can add any car that is modified in some way. We do prefer to have cars that are modified by yourself, but cars that are modified by Tuning Shop's (RUF, RWB, Spoon, Tom's, Rocky Auto, Powerhouse Amuse etc.), other custom builders and shop's (George Barris, So-Cal Speed Shop, Roy Brizio, Hollywood Hot Rods etc.) and cars modified by their manufacture's performance companies (Nismo, TRD, RUF could also be considered here too etc.).
As long as it's modified in some way, it's accepted! But, as I said before, we do prefer you modify a car yourself, it makes it more sentimental and it's all in your own 'taste'.
Quoting jimi laaksonen
And i like be modedator or admin! (Dog puppy face :DD)
Ohhh... Well, we'll have to see. If your an active member and can bring in more members to the group, as well as promote the new contest we are having and contribute your builds to this group and the contest, then we'll consider it.