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Nope, the DV+ is not a blow off valve. Its just a billet diverter valve, for cars who are running higher boost and want a more reliable replacement to the rubber diaphragm DV's that can tear from increased temps when running turbos outside their efficiency range (typical tuned car).
I've actually had one of these and run it on my 2011 GTI with K04 turbo. It works fine, but is not a BOV.
P.S. Atmosphere venting of boost (blow off valve) reduces performance and increase lag all with the added benefit of additional noise? Why not just get a cheap bluetooth speaker and wire it into your OBD port and run a raspberry pi to watch for shifts and then it sends a sound through the BT speaker. Might be cheaper and it won't hurt performance.
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