First of all just had studs, egr delete, oil cooler, coolant filter, gauges, stc fiiting on hpop and ipr sensor done and this only happens when runnin tunes on SCT not when stock tune is in. When cruising and I go to accelerate without letting it downshift and the turbo spools good it starts making a loud chirping noise coming from in front of the steering column and gets louder the more boost it makes. Once you go WOT it will kind of shudder and you can here it in the exhaust note as if it is losing boost or maybe a leak (maybe loose clamp) I dot know if that would cause this also havent noticed anything in boost gauge but am runnin factory gauge so may not any help would be greatly app. thanks.