Have been thinking about buses having their own sounds rather than having default truck sounds. And here it is!
This mod adds sounds to the following buses:

Busscar Jumbuss 360 by Fabian Espinoza
Marcopolo ideale i770
Marcopolo g7.o500rsd
Man Irizar PB
Man Irizar New Century
Man Irizar i6 4×2 By thio Monicho
Irizar i8

Credits:
Taku Martin Dnyire