if you look in the pic below you will see the secondary peice to the box. The hole in the rubber actually allows for the gas filler to be installed threw it..
or that was my understanding when I owned one and opted not to install it..
I have that setup. I opted not to use the piece that attaches to the gas cap. It works just fine, but your better off using the stock airbox with the DF intake. If your looking for looks then just get the lid. The DF intake fits nice and snug in the stock lower. :smile:
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