I just ordered a meter (no, not a super accurate very expensive one) and will do some testing as soon as I take delivery... And then some actual "after" data once I add additional sound/thermal isolationI can reproduce slight whistling when the vents are on the face+leg setting. However, I also have abnormal wind noise even when the HVAC is completely off. Considering others have no wind noise, I think there must be an issue on mine because I am measuring 88dB (on iPhone) at 80+ mph.