it going to do that with any exhaust you by, its the turbo making that noise, dont worry it will grow on you and you will like it

 

why doesnt the stock exhaust make that whistle??? restrictions?? It almost sounds like a piece of metal is bent sideways causing the air rushing past to whistle

 

I think the whistle comes from the vanes in the turbo. My lly is doing it now that the kitty died. Sounds like an exhaust leak.

I did an exhaust on an 04 powerstroke and it starts normal and sounds normal for about 3 seconds then it starts to whistle. Also put on an elbow, can someone explain the butterfly valve under the powerstroke intake elbow???

 

He's correct in his statement about the turbo vane. Some trucks are more prone to it than others due to tuning and mapping files at idle, but all the trucks with this type of turbo geometry are going to do it with a free flowing exhaust.

 

Still sounds awesome with the turbo whistle!

 

I just got the 5" mbrp turboback and your truck sounds just as good. The whistle sounds awsome