"Subtly" or to be "subtle".
The popping/pinging noise you hear is the coils slipping around in their perches (or the perches slipping around on your strut tower or lower strut perch) causing this popping sound. You probably don't need to worry TOO much. I vaguely remember reading somewhere that these required some sort of custom work being done to either your strut towers or your lower strut mounts, though... you should make sure you installed these correctly by contacting someone who has done this type of fake coilover install before.
Good luck