Whistling?

[Dragon240]

From about 3400-3700 rpms there is a considerably loud whistling sound. It does it accelerating, decelerating or any other time it passes through or stops in that rpm range. I can hold it there (45ish in 3rd) and it will whistle the whole time. Best I can guess its a vacuum leak somewhere. Took it to the shop and three mechanics swear they dont hear it but I know I'm not crazy (well maybe I am, but its surely whistling) So what's the best way to track a vacuum leak or what else could it be?

[Big Manne]

my car is doing the same thing . i just like to think it is my turbo spooling. but i dont have a clue of what it is either

[Dragon240]

One problem.. I have no turbo.

[Big Manne]

lol niether do i

[240sxJay]

Ball bearing? Maybe the belts need to be tighten. I'm having the similar problem with my car, though it's VERY random. Never seems to make the noise when a mechanic is around :P