So I have noticed on my car when the engine is cold after starting it overnight the turbo seems louder and has some of the dreaded whine/siren noise however after the engine warms up the noise goes away, is this normal I have linked a video so you guys can hear it, turbo is new has like 15k KM on it car has about 97k KM car is a MK4 Jetta
https://youtu.be/FfKubuA3eaU
https://youtu.be/FfKubuA3eaU