Metallic Whirl Around 4K RPM

CaptainSlow

Hey Gang,

I'm having a bit of an issue with my car. For the last few days I've been noticing that once I get past 4K RPM in any gear I hear this metallic whirling sound along with the engine sound. It makes this sound only when I press the accelerator. It's only started recently and never was present before.

I went to the dealer and the service manager and a tech heard the sound and they said it may be a regular sound with the car (which I doubt since it wasn't there before). They took another look at it on the lift and they found that there was a heat shield loose and they tightened it. They tested it out and said it was gone but I've noticed it again today so far all I know they must have assumed they fixed it. I plan on calling them again tomorrow but I would like to get some answers to help them diagnose the issue as they claim it's a regular sound.

Here are my questions:

1. Anyone know what I'm talking about?
2. Can a heat shield cause this sound after 4K RPM? It may be present before that but I can't hear in the lower RPMS (it gets louder at 4.5-5RPM).
3. Is there anything I can deal the dealer to help in the investigation of this sound? I would like to get it fixed as it takes away from the great sound of the engine roar.

Thanks!