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/j9nuwq1a4qnh1.png?width=731&format=png&auto=webp&s=463a0c197f6655dfe6bdb22cdcf4a72775e4a267