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I feel that by doing a double filter setup you're making it bigger than it really needs to be. You can cut the side of the trunk and make an oval, or any shape opening and put whatever scoop you like on there. Also, a good thing in that case would be to build a box around your intake, that attaches to the side of the trunk wall so that it's completely isolated from the trunk and takes air only from the outside. You can get fancy with this or be real simple. Insulation of some kind could be used to keep heat out as well. I'm trying to dig up some photos I had before of the same setup, but can't find them yet.
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