Okay so heres a 2008 ford f350 sound mod.
the sound files are light weight under 100mb.
the audio sounds like the real ford f350 
okay so heres a disclaimer before you install i could not get the files to work with modloader however.
I was able to replace the audio files in 88-89 folder with Alcis,s SAAT front end.
okay so heres how to install first you need Alcis saat front end installed 
open alcis saat front end >set your gta directory then go to sfx>genrl.
then go to bank 88 and replace sound_001 and sound_002 with the new f350 sound_001 and sound_002
after that go to bank 89 and replace sound_001 and sound_002 and sound_003 with the f350 ones.
then click save. after that launch gta san andreas and enjoy it goes well with a ford f series mod anyways enjoy. 
   