I don't know if you have noticed but in the Data>Audio>SFX You can find the:
IPspchB.viv, IPspchE.viv, IPSPCHf.viv, IPSPCHg.viv, IPSPCHNb.viv, IPSPCHNE.viv, IPSPCHNf.viv, IPSPCHNg.viv
files as well.
I know you can also find them in the Data>Cars>*AnyCarFolder* however it caught my eye if the ones in the Data>Audio>SFX add something more or are them the same ones from the Cars folder.