'Car Folder'/extension/ext_config.ini
________________________________________
[AUDIO_VOLUME]
ENGINE_EXT = 1.0
ENGINE_INT = 1.0
GEAR_EXT = 1.0
GEAR_INT = 1.0
BODYWORK = 1.0
WIND = 1.0
DIRT = 1.0
DOWN_SHIFT = 1.0
HORN = 1.0
GEAR_GRIND = 1.0
BACKFIRE_EXT = 1.0
BACKFIRE_INT = 1.0
TRACTION_CONTROL_EXT = 1.0
TRACTION_CONTROL_INT = 1.0
TRANSMISSION = 1.0
LIMITER = 1.0
TURBO = 1.0
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Adjust to suit.
Apologies for posting a reply to a post from over two years ago, but this quoted post is actually one of the only places I've been able to find with this very valuable suggestion. To add to it, while it doesn't seem to be documented anywhere and wasn't obvious to me at first, the AUDIO_VOLUME section actually supports all of the car-specific sound events from GUIDS.txt, not just those above as used in example configs. I had a mod with extremely quiet tyre sounds that made threshold braking difficult, and boosting SKID_INT and SKID_EXT through the config sorted it out with virtually no effort. Very handy considering how difficult it is to edit sounds otherwise.