Whistle noise between 2500 rpm - 4000 rpm

[Spiritspoof]

Hi,
Im pretty new to the whole Mustang community. Im from Germany and own a S650 DH 6 Speed Tremec since two weeks. Sorry if my English isnt perfect.
Im now at 1000 Miles and did my first oilchange today. I have a whisteling noise during medium to heavy load at acceleration starting at around 2500rpm and dissapearing at about 4000-4500 rpm from day 1 . To me it sounds simmilar to a Turbo spinning up (high pitch upscaling whistle). Im only able to hear it if my window ist opened. I think the whistle is coming from the transmission, because i never heard it when reving stationary. Does anyone have a simmilar issue or maybe even a solution to this ?I Had it at the Dealership today, they told me they can hear it, but have no clue what it could be. They dont have that much of experience with Mustangs and American Cars, because in Germany they are pretty rare vehicles and the Mechanics seem to be a bit lost on that type of Cars.
Hopefully some of you guys have more experience and can help me out. Maybe its state of the art ?

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[Q6543]

It’s the throttle body actuators… at certain rpm input you get the sound, amplified if you pull carbon traps or run a metal CAI

 

[Spiritspoof]

Thanks for the reply. What can i do to stop this noise? everything is stock on my engine. If its engine sided, why does the noise only appear during medium to heavy load while driving and not recreatable during stationary revs ?

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