the problem isnt if it "opens and closes fast enough"...on a DSM, the stock BOV would recirculate AFTER the MAF (the MAF was built into the air filter housing) so the same amount of metered air would be there. if you took off the hose and plugged it, youd be venting that metered air to atmosphere, thereby making the car run slightly rich.
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Matt

B18B1 FTW
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