Horrible high pitch noise after hitting around 14 psi boost. Starts there all the way up and doesnt stop until i drop back to around 10 boost. No problems building the boost other than the noise. Less than 10k miles ago the head gaskets were replaced, arp head studs, egr delete, new oil cooler, new injectors. At first i thought it was my pyro probe but ive completely gone over/changed it with no change in noise. Any ideas would be great.

 

ou have the plastic CAC tube on drivers side the it is probably cracked, very common, if not that then its a cracked boot but realy think it is the CAC tube

 

Could also be a separated turbo uppipe