The O-rings do blow out and will cause the noise you speak of. Metal on metal vibrating = high pitch. When replacing the O-rings pick up a set of Viton ones. They will handle the temps better than rubber. I have also had good results using a high temp silicone gasket sealer in addition to the O-rings. Other than that make sure the pipe is aligned properly.
Some have used a slightly thicker O-ring which makes it a bit harder to get the pipe on and off but provides a nice stable seal once on.
When the o-rings wear out the spooge will leak from the bottom and vibrations/noises will occur. Mine are mostly on decel.
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