[chaoskaze]

errr....dont think it's the strut at all. That's just blind guessing, aka I don't know what to do so i'm gonna replace this thing.
noise from the rear if it's clunk, it's gonna be one of the bushing/brake area/diff & sub frame area. cuz nothing else moves.

You also said noise goes away when it's warm. meaning it's likely small clearance issue


find someone else who has a twin & let him drive it while you sit in the back, maybe that will help you locate where it's from.