i dont know if tis is the right section to be putting this in but i think the concern has a lot to do with the mods it has. i have a 2005 f250 6.0 diesel with the banks 6gun tuner, cat delete, bigger intercooler, bigger intercooler pipes, banks high ram intake, banks ram air intake system, 5 inch exhaust cat back, and a 12 inch lift. It was brought in for coolant bubbling and of course the egr cooler was blown out but it also had this hoot noise when u would boost it up and let off or if you are towing it would maintain the hoot noise. Has anyone else ran into this?