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Your fluttering sound is most likely an air leak. How is the box sealed? You can removed the driver and then run a bead of silicone around the edges inside the box. Then put a thin bead around the opening for the driver and screw the driver back in place.
How you mount a box in any automobile depends highly on what is available. Just screwing it to the floor is an option but it is one I use as a last resort. If you do decide to go that route, make sure you know what is on the other side of the panel you are screwing into.
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