for weeks now i have had this loud hissing sound when on boost. I know your all thinking boost leak.
I have presure tested the whole system found my 007p leaks above 8psi but thats it. so looked at the intake pipe, I have removed the PCV return from the TIP and blocked this off the noise still there.
removed the DV completely used bungs both sides, still the sound is there.
Im running stock air box, it does it with both BMC filter and stock.
Any help would be great?