Removing the foil insulation wrap (installed by Ford to deaden the turbo whistle, shame shame ) from the hot side (driver side) intercooler pipe.

https://www.ford-trucks.com/forums/s...d.php?t=487115
https://www.ford-trucks.com/forums/s....php?p=3657312
https://www.ford-trucks.com/forums/s...d.php?t=488594

Ends up looking like this (pic of my truck's pipe freshened-up a bit ):
http://community.webshots.com/photo/...86590301OtHfpL