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A quick update. They worked on it for 3 hrs and concluded that it had something to do with the Harmon Kardon sound system and its active noise canceling system. Funny thing is that was making the noise again 15 minutes after it was fixed. In hindsight I suspect that they were on the right...

It is going in this morning. I think I have isolated it to the exhaust system or some part of the emission controls. I just started hearing it this morning while parked idling. Hopefully they can figure it out. Thanks

I just replaced my 2017 PW with a 2022. I have less than 2000 miles on it and it is making a hollow thumping noise after about 35 minutes of driving. At first it was intermittent (no rhyme or reason) while accelerating, coasting and braking and mostly above 40 mph. Now it is almost constant...