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I had a similar situation but with a Synapse valve and it just turns out that the car doesnt really respond well to low rpm, high gear, high load situations. My valve would open and vent charge air, but before it could vent all of the pressure, it would close then open again, finally releasing the whole intake tract. It seemed fine in gears 1-4 but if i pushed the car in 6th at, say 3k-3500 and let it off around 4k-4500 after passing, i would get a "chuff-chuff" sound that i could actually feel in the car. It was not repeatable either. I think it ends up being a load/fueling targeting thing and not necessarily in the BOV, since the DVs/your BOV is run off the vacuum system.
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