It would be quite crucial to first define what is this 'best' you have in mind as there are no such thing as best, only sometime that fits most accurately to what you want, but as people have different wants it is impossible for anyone to know what you would deem as best with available data.
Thank you for the reply. I did find an amazing sound kit here: https://www.beamng.com/threads/67-camaro-v8-sound-for-gavril-vendetta.54432/ but it looks like it is for only one car, the Vendetta. I am going to figure out how I can possibly apply this sound to other cars