Download mod Sounds for Sport Cars Pack v2.6 by TrafficManiac (1.33.x) for ATS | American Truck Simulator game.
my mod must have higher priority in the mod load order.
in addition with my Real Traffic density mod (see link below)
https://steamcommunity.com/sharedfiles/filedetails/?id=1213282672
you can make sport cars as separate type of vehicles with own spawn rules by simply renaming the sii file from def/vehicle folder (base mod) into traffic_storage_sport.tm.sii
with this modification sport cars will have individual spawn rules from my traffic density mod and you no longer need other mods than my sounds and the base mod
additional info:
this is the same sound pack as for ETS2 but the main mod is not the same as in ETS2 (one car is different)
Tested on game version 1.33.x