930 Vacuum Regulator.Replacement

[philipguziec]

So my 89 930 wasn't coming up to full boost, And my shop tracked it down to a leaky vacuum regulator. It sounds like the job of this thing is to release over pressure in front of the throttle plate when there's vacuum in the intake manifold and the Turbo is spooled up. I would just replace it but Porsche is asking 800 bucks for what looks to be a $10 part. It also appears to be a part that's common to other Porsches of the era and probably to many other vehicles. Is anyone else familiar with this part or have a substitute or rebuild process?