i have this noise comming from seems to be the EGR. in that area but from a stop as i take off it makes a very low fluttering sound. you can only hear it with the windows down. i didnt really look into it very much yet but before i do i want to see if anyone else has this noise. it almost sounds like compressor surge.

 

i remembered this thread from a while back...maybe it could help, maybe not.
https://www.clublexus.com/forums/sho...intake+whistle

 

almost but didnt really help. it sounds like its coming from the EGR

 

i think its just the EGR purging