AllieEdge5, My wife's 07 Edge SEL is doing the same thing as yours (the loud POP noise coming from the shock towers). Did the tightening of the tower bolts fix it? And did you just tighten the four bolts on top or the actual nut for the strut? The four up top look pretty easy and accessable, but the strut nut looks like it'll be a real pain!!! I just had it in at the dealer for new tires, oil change, and state inspection. Of course during the inspection they found the front lower ball joints on both sides were shot and I didn't have time to mess with them so I had them replace the ball joints too. I also had them do an alignment because of the new tires and ball joint replacement. It was fine for 4 days and then my wife came home and had me go out and back her car out of the driveway. There is a dip at he end of the driveway and if I turned while exiting the driveway it made the noise. If I drove straight in, no noise. I also read on another post it could be the chrome plastic wheel covers (which are on my wife's car) I'm not looking forward to taking it to the dealer, but since there is a TSB on the wheel covers and that might be the issue I'll have to do it. I'll try the tightening of the shock tower nuts first. Thanks for listening!!