Hi, my 05 SRT-4's turbo make a kinda high pitch whistle noise. The weird thing is that it only makes the noise when the car is cold. So basically if i haven' t driven for a while or overnight, then start it up and drive and when the turbo kicks in there is a high pitch noise. After a little while of driving the noise is gone as my engine warms up. If any one has any insight i would love to hear it. thanks.

 

check it for boost leaks