cayenne clunk in front end 09 base

[stormin48061]

hiya , done some researching on this "clunk" in the front end of cayennes and it seems to be a chronic issue. Usually I get the clunk when i back out of the driveway and turn the wheel to back out at the exiting the driveway. It clunks once in a while intermitttantly when i go over some bumps. I have replaced the control arm, sway bar, upper and lower arms and still get the clunk. anyone have a definitive way to determine what is clunking without aimlessly replacing any front end part that has bushings? There has to be a better way to diagnose this issue. Thanks for your help..