Houston, we are clear for takeoff. This stacked 2003 Powerstroke has one of the loudest turbo whistles I’ve ever heard, and would you believe that it’s stock? Yep! Using a Ford scan tool, he is simply manipulating the VGT position on a completely stock turbo by opening and closing the turbo vanes. Although, the straight pipe adds little bit of a hearty sound to it.
Duramax guys be like: