Without more information this one is gong to be challenging.
There will always be a high pitched whine/whistle from the induction intake . Do you have the original "black cylinder" with a circular air filter inside? Or have you upgraded to less restrictive type (cone etc)
It does sound like something on the air intake side , so I would be checking the air filter , the "black box" and the air mass/air flow sensor (do you have 13 CUX "Flapper", or 14CUX "Hotwire"?) for leaks and correct functioning . It is unlikely to be within the inlet manifold , but I guess we can't rule it out yet. Also check all of the rubber connectors and electrical connections into the plenum. You may have an air leak there.
Can you attach an audio file with a recording of the sound?
Last edited by MOG 615; 02/08/23 09:41 AM. Reason: clarity
