This sound pack includes sounds for all trucks from jazzycat pack, however it's is called "Old Trucks Ai Engine Sounds" because old engines are the best of this pack! besides personalized sounds, I increased the spawn of the old trucks and I adjusted max_speed and torque for some trucks. the storage files of the main pack have been also adjusted to match with the rules included in my Real Traffic Density mod. read the section "How to use" below if you don't use my traffic density mod.