Interesting Air Intake noise when I get above 4500 RPM | 2007 Buick LaCrosse CXL

[Gavinr22]

Hello, I am the owner of a 2007 LaCrosse CXL and for the past 2 weeks I've been trying to find out what the cause of the noise is.

The car is well maintained and It has just rolled over 38,000 miles (Incredible right?). When I get on the highway, and reach highway speeds, it sounds like a soft whistle noise when I reach around 4500 RPM. It's just fine at lower speeds. I'm thinking it might have something to do with the throttle body but I inspected it and it was just fine!

If one of you has had or know anyone has had this issue before, please let me know so I can keep my sanity when getting on the freeway

 

[MelsRegal]

You cannt duplicate the noise in Park with the hood open and someone else slowly raising the engine rpm?

 

[Gavinr22]

You cannt duplicate the noise in Park with the hood open and someone else slowly raising the engine rpm?

I cannot, for some reason it has to be in drive. Which now brings me to the idea of an intake. I might be able to record the noise using one of my microphones if that would help.

 

[MelsRegal]

Can't see how recording the sound will pinpoint the source.
No check engine light on?
No maintenance done to the car immediately prior to the noise starting?