how do i get custom afterburners

ive seen my buddy have a skin with custom skins and im pretty sure they removed it so how can i do the same?

https://preview.redd.it/4rbrogwy3qnh1.png?width=393&format=png&auto=webp&s=69b2f5fe4fdcb602036316bb4a3fa5bccdb600ac

sorry for the bad pic