I'm gonna have to disagree with ya. I did notice more gains from removing the black silencer. You're greatly increasing the ability of the intake to pull in more air by removing the black pipe, cool air is still going to make it into the airbox, it's just going to be mixed with a bit of the warm air from the engine bay. Instead of funneling just a bit of cool air, you're pulling in a larger amount of warm air. What may be a better way is to cut a larger hole into the intake-box and use a 90 or 45 degree piece of 3-4" PVC to direct air in, that would give the best of both worlds.
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