Great sounds! I can only second Greyhead, do you have more? Some new sounds for touring cars or LM cars would be fantastic!
I use "Old Ferrari V12 sounds" made by Ruud Zuiderwijk for my 1992 SWC carset. But I accidently forgot to mention his name in the carset...
![Shame on you [-X](./images/smilies/eusa_naughty.gif)
I think they can be used also very well for FIA-GT cars. At least I found this sound, when searching for a nice sound for the Panoz.
Once I tried to convert some sounds from F1-Challenge, but it didn't work and I forgot about it.