Sorry for the epic bump, but I was wondering if there is any chance of a piston type VW valve letting go?
I used to have the diaphragm type valve until I remapped it and very soon after emission lights on the dash suggested that it was history. When it came out it was torn in several places! It was replaced with a VW piston type valve, not sure what revision, but now my turbo is whistling a little and I wonder whether this one is letting go too - nothing on the dash/vcds to suggest so.
Might go for the Forge version this time!