I don't remember in which thread was, but someone mention to delete some original skins, and i told him not to do that, cause he could have troubles if want to go online, there's a app to disable original skins. (Not my app)
http://www.racedepartment.com/downloads/acskindisabler.5615/
http://www.racedepartment.com/downloads/acskindisabler.5615/