I took it in for them to listen, and that's what they thought it was. I have Berk HFC as well and they used to hiss some, but this sound is a chirping rattle. I don't see how they could make this type of sound. It only happens lightly under accel but really comes on on deaccel. They obviously saw I had the HFC on too. I hope the new mid pipe gets rid of it.
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