Unfortunately, I found a typo at least after the release, that causes the highest on-load-sound of one car not to run at the inboard-view. If somebody does not know the sound, as it should appear, this wouldn´t be audible, as the sound underneath as well is to be heared till the maximum-rev - just sounds a bit thin.
I did a quick-fix now, where the faulty AUDs are replaced with working ones. Those new AUDs have a different entry at the header, named:
// Ver. 1.1dF(ixed) - Slalom-spezial //
instead of:
// Ver. 1.1dF - Slalom-spezial //
at the original to make them distinguishable.
Here the Fix:
http://www.citytea.de/DataGTL/Fix_for_Typo_in_AUD-File-Kadett.rar
Just unrar and put the GameData-folder into your GTL-Folder as usual.
Sorry for this unpleasantness!