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I installed the cold air box and open air filter on my '01 viggen. WHat I believe to be the purge valve was attached to the rear side of the stock air box. The new metal air box didn't have the tab to attach it to. Maybe your valve is loose? I had to rig some zip ties to secure it. I'm not positive what the valve is but it has a couple rubber hoses attached to it. I agree, the open air filter is much louder. I'd like to attach a vacuum gage and see for myself if there's a big reduction in pressure loss over the stock air box.
dave
posted by 68.10.24...
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