FWIW, I'm an instructor and an Elise owner, and I often get weird sounds that I cannot place. Don Kitch (owner of Proformance at Pacific Raceways) drove my car once after I heard a rattle that concerned me and came to the same conclusion: these cars make noises. Which is not to suggest that you shouldn't try to track down the source of the problem -- particularly if it seems to be coming from anything related to the suspension! -- but it is to suggest that you might reasonably *never* identify the source of the sounds and (in my experience) they often "go away" after a while.