New exhaust sound.
If turbine sound is too high for you open mod with winrar and go to:
def/vehicle/truck/scania.streamline/sounВ­d/(both exterior_v8.sii and interior_v8.sii

Scroll down and find this:

sound_dаta: .t
name: “/sound/truck/scania/v8_int_v2/turb­o_int.ogg”
looped: true

volume: 1.60
Change down volume from 1.60 to like you want.
Save mod with winrar.

Author: Volidas