1. Try turning the AC/defrost on and off. Sometimes my AC compressor makes louder whining noises depending on temp. Hasn’t failed yet so assuming it’s fine. 2017 STi

  2. Thanks for that. But it does not seem to be this. Could it come from not installing the oem air filter correctly? When I bought it, it seemed to have an accessport. The last owner might have thrown an intake with it?

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