The flap is part of what i called the induction funnel. Its not part of what you are replacing but the trumpet sits in it. Not sure how not removing it will affect. But as you can see in the pic it is fairly restrictive. I guess in the end its up to you. Id say hhave a look when you take it all apart, and see what you think. I cant see how anything can get into the airbox if you do remove the flap but thats my opinion.
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