Whoa. Thread revival.
I no longer have this screeching sound. It eventually went away.
The screeching noise was 100% coming from the Exhaust Flap Actuator. I went under the car, had my friend start it up and I was able to pinpoint the noise to the actuator. I disconnected it at one point (just pull the plug). But reconnected it a few minutes later after a few runs around the block.
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