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Thanks guys. Yes, Eric, I meant compressor! Thanks for catching that.
1) I will have the tech replace the belt and roll all the pulleys to makes sure none are seized.
2) I put some cardboard tabs between the cowl and window and the same old sound persisted... so i'm pretty sure it's friction between those two interior pieces. I hate to take stuff like that apart because I usually break a clip/tab or pry someplace I shouldn't & make a blemish. Maybe i'll look around for some instructions on taking the dash/pillar apart.
3) The noise is coming from the engine compartment for sure. It truly sounds like an exhaust leak to me... but since it's coming from way up there it would almost have to be header or the joint where the header meets the main exhaust pipe. It gets slightly better when the engine is warmed up. A few times, for example, when accelerating hard onto the interstate, I've hit a higher-than-average RPM and the engine actually gets quieter. You can hear the culprit sound stop and then (for a moment) the engine sounds how I would expect. I can check the intake resonator & I will work on getting some audio for you guys.
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