Grasping at straws here....do you have a Comptech Foam Filter? If so, that may be the source. I have a turbo like whistle from my car at certain throttle positions because of the comptech filter.
Originally Posted by Dev
I can only describe it as a constant chirping noise (subtle) that appears >2000 rpm. It comes from behind the valve cover near the injector rail(not injector chatter). It sounds like a vaccum leak...but I cannot find one.
any advice appreciated thanks in advance
Dev