Which Sleeving Video Is Best?

[as400]

Not sure what the difference between a half sleeve and full sleeve is but am getting the impression its a cheap way to make the exhaust sound louder.


https://www.youtube.com/watch?v=UAFxaWeaGsA

https://www.youtube.com/watch?v=A4E9-XIwg7U

https://www.youtube.com/watch?v=fGZmRbHUiVc

https://www.youtube.com/shorts/uZrTsc58JrQ