Thanks Manny for your help. Is it possible to hear this pop not only on the outside of the car, but once in a while it gives me the impression that it also sounds through one of the speakers inside. Maybe the noise is so loud that it just appears like it comes through the speaker. If it turns out to be that separated baffle, is the only way to fix it by replacing the muffler and is it dangerous to run the car with it doing it. What exactly did your friend end up doing to fix the problem? Thanks again. Board members like yourself are great to talk to. Scott