this might sound dumb.... but PERHAPS you migh've droped the car and the tire is somehow hits the fender from the inside on those occations (PERSONAL EXPERIENCE on my 240z) also u might want to check the shock being good if its not the supention is not being rebounded back down and ur tire hits the fenders. if you cold give us a little bit more insight on a somewhat more PRECISE sound it makes or other ocations the car makes that sound does it sound like the type of noise a messed up halfshaft on a FWD car makes or something like that that would help us give u mire feedback.
Just tyring to help
