I've made a small pack of my personal engine sounds if anyone wants them, I don't have them for all the cars and some might be a little loud for your liking, but I'll maybe add the missing cars later too.
Here's one I just made up for the LX6. I've been playing LFS for over 5 years and I only found out half an hour ago that it now has an in-game sound editor
It sounds like it has a turbo screaming inside it. All i need is a blow off valve sound (which I don't think the XRG lets you add) and it would be perfect.
Here are some real life sounds i recorded from my S15 in action. all real sound recordings edit tweaked and converted to LFS. Sounds include the realest lfs skid sounds you'll every come across i have never found anything like them in 4 years of being in LFS that's why i broke down and made some hope you enjoy.
Replacements:
tire skid, Blow off valve, Horn, Shift, Wind, Road, Scrap, dirt skid,grass skid, and more.