Well, that sucks... (No offense
)
Ripping Radio files can be acceptable as it does not have big impact on the game. You can simply copy some of your own music into the game's folder and the tunes will play when you enter a vehicle...
Totally ripping speech files is not acceptable for me as it ruins the gameplay (at least in my opinion).
Can you make some type of optional settings to the conversion? So that people can chose whether or not they want to remove the sound files?