6.0 weird noise when boosted

[107stroker]

I have a weird noise when my truck builds boost. its hard to describe, nothing like the turbo fart when you let off the go pedal, its like a buzzing whistle sound. i dont smell any exhaust under the hood so maybe not the up pipe. i have studs, sinister delete, stock air intake, cfm large mouth. any suggestions as where to look.oh yeah i have a new coolant cap when the studs were done bout 10k miles ago. sounds sorta like the cap did when i blew the gaskets but louder so its gotta be pressure bleed. right

[skid326]

I just got my oil cooler and egr cooler done at a local dealership and have noticed a sound similar to this. It increases in loudness the higher the rpm's get and once I let off the pedal it slowly decreases. It is not the turbo whistle, it last almost twice as long as the turbo whistle when I left off the pedal

[107stroker]

yep you got it.

[107stroker]

anyone got any ideas on this

[107stroker]

Anybody got an answer.

[8URZ-28]

I hear the same sound on my 07 and its stock.....for now

[107stroker]

Anyone else got an input

[DDBCK]

Mine did it too, a very annoying whistle when building boost the more boost the more whistle. It was a crack in the Y-Pipe. 4months later it started again, this time it was a crack in the Up-Pipe.

[107stroker]

Originally Posted by DDBCK

Mine did it too, a very annoying whistle when building boost the more boost the more whistle. It was a crack in the Y-Pipe. 4months later it started again, this time it was a crack in the Up-Pipe.

great, how much was the y pipe to fix. the up pipe is what i replaced with the sinister egr delete kit with stainless wasn't it.

[DDBCK]

Yes. The pipe was $250ish but the labor killed me from the Stealership it was $650ish. All to gether it was $947 w/tax and all. A local garage could have done it cheaper by $200, I checked afterwards oops.