super googan
Wizard
That doesn't seem logical unless the hoses leaked. You are effectively doing the exact same thing whether you just plug it or use the plates.
I agree it does not " seem logical " My hoses all appeared to be tight and in great shape.
The only thing I could think of was that the approximately 20 inches of hose have enough air in them to still create some popping.
Blocking my hose at the airbox reduced popping about 70% and capping at the valve cover reduced 95% of the popping. I used 2 vacuum caps on the stock plates.
Some other people have had the same result.
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