The mod replaces the standard, not quite suitable for some cars, sounds with more believable or suitable for them.
Changed:
Diesel sound from Dubsta, Bodhi and Bison on exactly the same, but gasoline from Baller; Same Baller sound for Schafter and Serrano, now more like a 6.5 AMG engine; Sound from Franklin's Buffalo for Schwarzer and Surano; Weak sound from Banshee and Bullet replaced with a powerful one from Hotknife (Not the best, but so far I have not found a better replacement); Normal V10 sound from Ninef; Less aggressive sound from Fugitive; The inappropriate Dubsta diesel sound of the Glendale has been replaced with a more acceptable Chino sound.