I’d like to share an untextured mid poly model of a Celica GTO.
The model for you comes unwrapped, with assigned materials. Keep in mind that this is a mid poly model which relies heavily on the use of custom normals - changing the topology might introduce shading artifacts.
Here are some masks that might help you get started:
https://drive.google.com/open?id=1etAt7mDtySvkqJOCAN_8LBCh1d00KuUd