Version 2.0: 1.27 - 1.36 ats game version v2: Hot fix. Peterbilt 579 paccar sound bug fixed. Paccar interior sound adjusted. - Hi guys this mod change standart scs peterbilt trucks engine sounds with real sounds. Peterbilt 389: - Cummins İSX15(NOT X15) engine sounds added for vanilla cummıns engines. - I dont touch scs engine sound its Paccar mx engines sound(old). - Caterpillar c15 twin turbo engine sounds added for vanilla caterpillar engines. - All engine prices are optimized. - You can try in company truck quıck jobs. Peterbilt 579: - Cummins İSX15(NOT X15) engine sounds added for vanilla cummıns engines. - Paccar mx-13 engine sounds added for vanilla paccar mx engines. - All engine prices are optimized. - You can try in company truck quıck jobs. HAVE FUN!