My truck has been deleted since 5k miles, currently at 88k miles (EGR still intact).
I am trying to figure out what is causing my exhaust to whistle so loud.
I am not running the whistle tune (I never liked it).
On start-up, the truck will have the usual hiss it has always had; however, after a couple of minutes, the exhaust begins to whistle and only worsens as the engine comes up to running temp.
This has been going on for about four months (I know, I know, been putting it off).
About a month ago, I replaced the turbo actuator.
I checked around the manifold for signs of soot but saw nothing.
Manifold looks normal from what i can see with the EGR in the way.
The truck builds boost just fine and drives like it always has.
What else should i check?
What could be the problem?