Is this normal!!?
 

Is it normal for a 7.3 or any turbo diesel to sound like a jet engine when it's really cold and turbo is kinda laggy until up to temperature? If it's above like 40 degrees it don't do this.

It sounds like it is just working harder to achieve a higher temp, personally I like the turbo to sound like a jet.

Your hearing the EBPV

What's that??

exhaust back pressure valve, it helps with warm up when its cold

Alright so it's no big deal? New to the diesel world. Just trying to Learn more and more about it each day

if it shuts off when you start to drive it or when it gets warm then its fine