So only recently my mps3 gen1 with tein ss coilovers fitted(still in fairly new good condition) started having a moderate/loud metal rattling noise from the rear drive side while driving on almost any surface(obviously louder and more frequent on bumpy roads). I've jacked the car up 3 times and the checked the wheels, wheel bearing, sway bar(endlinks, bushes), springs, shocks, rotors and calipers and nothing seems to be out of place or playing up.
Any thoughts?