well .. changing the vacuum hoses wouldn't do any harm .. fairly easy job ..I have noticed if i pull the blue stripe pipe off boost solenoid the noise stops on test run
use the 4mm inside diameter silicone ones .. available from a few places on the internet ..
i think i got the 3 metre length one when i did mine
just be careful getting them off that turbo vacuum reservoir
( i managed to break the plastic spigot on mine )
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