Honestly I love it, this is the best Stock 458 sound to date, even though its been made years and years ago, and even though SCIBSOUND made a Ferrari 458 sound (possibly one of the best modern day sound modders) this one is still better for the completely stock sound (especially interior, brilliant!)
Since there's some stuff from the stock AC Abarth sound and the interior sound is a bit quiet, you can make an extension folder in the 458 car and an ext_config.ini folder, in which you should write this (basically changes audio settings of the car without modding the sound files):
[AUDIO_VOLUME]
BACKFIRE_INT=1
BACKFIRE_EXT=1
BODYWORK=1
DIRT=1
DOWN_SHIFT=1
ENGINE_EXT=0.95
ENGINE_INT=3
GEAR_EXT=1
GEAR_GRIND=1
GEAR_INT=1
HORN=1
LIMITER=0
TRACTION_CONTROL_EXT=1
TRACTION_CONTROL_INT=1
TRANSMISSION=0
TURBO=1
WIND=1
SKID_EXT = 1
SKID_INT = 1