I've heard that It helps to reduce the boost lag you have between gears (for manual transmission cars).
I have never heard this. The only thing that a DV does on a MK7 is add sound if you get a BOV and remedies a fix if there is a problem with your stock DV. I got a Forge Atmospheric valve for the sound it adds otherwise I wouldn't have purchased it because the stock DV is much better on the MK7's than the past models.
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