Upon only WOT, i can hear what can be described as a very high pitched whistle coming from the engine bay. It stays at the same tone regardless of the revs, but only occurs during full throttle. It is pretty faint, but loud enough to hear and distinguish.
There is no whistle until about 3.5-4K revs. So during low down torque the whistle does not occur.
I've only noticed it recently, but because its so quiet it could have been occuring before.
The car is performing as per normal.
Normal? If not, any ideas?
Muchos gracias!