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I was planning on chiming in here again, as I've made some discoveries regarding my issue in the last 6 months. It turns out, I have two noises that are similar, and sometimes happen independently, sometimes concurrently. There is also intake inductance resonance around 4000 rpm which makes the sources harder to identify.
One of the noises is in fact the clutch spring. The other noise is in the reverse lockout collar mechanism.
The clutch spring noise is louder, more metallic, and definitely sounds like it is in front of you. This goes away with a light press of the clutch pedal.
The reverse lockout noise isn't as loud and persistent. It sounds like it is coming from behind the center console, but after you identify it, it is definitely coming from the shifter area. Pulling up on the reverse lockout collar on the shifter changes the pitch to be much higher.
My car has been tracked twice now since I posted last, and nothing blew up. My oil analyses don't indicate any serious problems. I have stopped worrying about this (finally).
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