This addon add's lacking backfires internal en external and shifting sounds when using ISI-CTDP2005 sounds. its a mix of carefully selected sounds which are already in the game ctdp06 sounds and isi sounds.
this is how i think it should have sounded, try it and let me hear what you think of it!
copy & paste this moddata folder in your Rfactor Root en click replace all !
nothing will be changed you will just have an extra soundpack option in the misc
tab on your ctdp06 controlcenter named Sebastian Keijmel CTDP 2006 & ISI Sounds