I have just re-done the sound effects folder for Live for Speed. The new sound effects can be downloaded by going to the first post and clicking the filefront link. These changes include new skid sounds, new scrape/crashing sounds, new horn sounds, new wind sounds and a new roadroll sound.
I might begin doing requests again in the near-ish future but at the moment real life takes over quite a bit. I try to do my own sounds and upload them whenever I have the time, but that is pretty much all I have time for right now.