BoomBap

Create a backup of the original sounds! 
Extract and copy to TDU2 directory.
 
For now the Sound Mod Packs inclued ;
Italian Pack :
Alfa Romeo 8 C
Delta Integrale Evo
Ferrari 308 GTS
Ferrari F40
Ferrari 430 Scuderia
Ferrari 458 Italia
Lancia Stratos Gr.4
Pagani Zonda F
 
Audi Pack :
Audi RS6 Avant
Audi R8 V10 5.2
Audi TTRS Roadster 
 
Japan Pack :
Nissan 370 Z
Nissan GTR 
Subaru Impreza STI
 
The sounds are quite acceptable, but could definitely use some tweaking.
I also have other sounds mostly ready but, honestly, the sound modding of this game is very limiting, even if the capabilities are good, the game doesn't allow for major changes other than just replacing the sound samples and adjusting their volumes.
Having created sound mods for other simulators and having used a lot of Fmod, as already said I find this workflow rather limiting and frustrating, especially not being able to set the correct laps for each sample and other important things, they lengthen the process a lot and create a lot of frustration, and they do not allow the best possible result.
If I'm patient and in the mood to do so, I'll finish fixing the remaining ones I've created, but I don't think I'll be making any more for the reasons mentioned above.
Ah, I almost forgot, the sounds were all sampled from real car videos, not from other games or anything.
 
Ok, i hope you appreciate the effort and that the sounds are to your liking.
 
Small Previews :
*Note, the videos is old and recorder in phase of dev.
ITA Pack
JAP Pack
 
AUDI PACK