Whistle at 45mph

Hey guys, I have had a whistle from around 42-48 mph only under load consistently for about a year now and I was wondering if anyone has had a similar issue. It's hard to pinpoint where it's coming from because it fills the cabin and on the jacks, everything seems to be fine.

It is only when accelerating and only in the 45 mph range.

Let me know if you have any questions or if you have ever experienced this or know anyone who has. Thanks!

Check out this thread by dreamspeed here. He posted a solution for the common, but arguably the most difficult whistling issue to identify in the S65 engine bay. But first, double check that the rubber seals between the plenum and all 8 throttle bodies are in good shape, if you haven't already.