I don't think this works the way you are expecting it to work... You are still restricted by the stock airbox/filter...
i don't believe you are getting more air to the engine this way either. it's like sucking on a straw. Even though there are two holes on the straw, you are still sucking in the same amount. But if you did Mr.5s DIY, he made it so you are sucking on two straws. make sense?