When I created the original muscle car model last year (https://www.artstation.com/artwork/8e4EPG ), I was just getting into hard surface modeling, and I wasn't very satisfied with how that model turned out. There were issues with panel lines, body proportions and lacking much customizable components. The original mesh was reworked and retopologized, optimized for game engines. New UV maps, textures and much, much more.
©Meisen Hu