I had a momentary squeal around 2000ish rpm on light acceleration for a long time. It was only in drive and if I held the brake and brought the rpms to that point, it would squeal continuously. I eventually came to the conclusion it was the cat in the header and a piece of it must have broken off and chirped at that frequency. After I swapped for a Tomei UEL, the squeal was gone. Might be something to consider.
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