In California, you will need to complete several forms of paperwork in order to transfer ownership of the car from your friend to you. You will need to have the title or registration of the vehicle transfer to you. You will also need to complete a Notice of Transfer and Release of Liability and an Odometer Disclosure Statement. You may also need to provide proof of insurance before you can legally drive the vehicle. It is important to complete all of the paperwork properly in order to prevent any legal issues in the future.