Systems and methods are provided for determining additional vehicle data for a vehicle based on a vehicle identifier, such as a vehicle identification number (VIN). Based on the VIN, manufacturer codes, model codes, and other additional manufacturer information can be determined. The manufacturer codes and/or model codes can be used in determining a list of options on the vehicle. This information can be used by a variety of systems in determining more accurate vehicle specifications to yield more accurate vehicle evaluations based at least in part on the list options.