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i found bypassing the n249 valve increased noise levels quite significantly; i think it is because the dv reacts faster and so the air is dumped at a faster rate?
 
i found bypassing the n249 valve increased noise levels quite significantly; i think it is because the dv reacts faster and so the air is dumped at a faster rate?

I did the same. Replaced the whole thing with a 4mm silicone hose. And I agree, I also think the valve reacts more rapid now...