Makes sense. If it has failed and it is expensive to replace and you do you want to put in a used one, just deleted it. Try it. It seems to work well for others.
As I believe was noted, it dose take a lot of pressure from the turbos boost spike to open these valves. They are not like the de-accel valves we saw on the early EFI cars that make the rpms drop with great delay from what I could tell on my turbos. Yes, they do benefit emissions but they can also help performance (boost recover between shifts) without hurting drivability.
Again, save the money. There are some very knowledgeable owners here running without it and they seem very happy doing so.
Enjoy.
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