After replacing the two vacuum lines between the vac canisters that run over the top of the engine to the vacuum hose (replaced this as well) off the vac pump, 90% of my nasty wastegate rattle went away! I can't speak for the longevity of the product yet, but it seems to be high quality. Very thick material. They say 4mm would fit but 3.5mm is OEM so that's what I went with.

About a foot to spare after and entire n54