Sounds like it might be shocks itll happen when you lower your car on oem shocks. Have a friend put weight on one corner at a time and sorta bounce it while you try and listen and get a better idea of where the sound is coming from. It could also be a number of bushings in the suspension system. Check the sway bar bushings and make sure they arent deteriorated. Also check the lower ball joints and see if the boots are broken they wont go bad without the boot breaking first. Just ideas.