I think you may find that the noise is caused by a lack of vacuum due to front and rear engine mountings being shot. Do you have the pop-pop-pop when you loosen the oil filler cap?
The vac pipes from the engine mountings run to a valve/splitter which I think also controls the wastegate valve on the turbo. Should be close to the airbox I think.
non-vacuum mounts are listed in the parts catalogues so perhaps you could terminate the pipes and get your vacuum back. There is a video on youtube under vacuum mounts I think.
Hope that may help.
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