[cardoc]

Welcome Greg,

It is possible it could be a loose intake tube or fluid inside the air accumulator or the air filter is vibrating because its not seated correctly.

Is it a H4 or H6? Knowing would narrow down the possibilities.

 

[cardoc]

I guess my sarcasm got lost. :1pat:

Still check the air filter fit and the intake tubing.

If you can determine a direction of the noise in comparison to the driver seat while its doing it, it may help narrow it down. Maybe use a lower gear to hold speed and high rpm?

If its not under the hood, its in the exhaust.