well i've been looking at making engine sounds but as they guy who made that sound mod for engines found there is no way to create a proper shutdown and start up sound and the engines at the moment dont sound as good as it could be when adding own sounds.
I think i'll wait till the SDK is out and the actual prs files are fully updated and a description of all the commands are published, basically if 1C do that it will be very possible to make a high quality sound mod.

I cant download that sound mod to test along side mine its being a nightmare, can anyone host it?

DONT GO ONLINE! YOU HAVE BEEN WARNED BY 1C THEMSELVES, if you do and you get banned dont blame me.