The Popchargers will not increase flow any more than a good OEM-form air filter and will draw in more air from under the hood than the factory setup (see gomer_110's and Nick Servin's comments above). If you want to do any good, you've got to get the coolest air you can. Under the hood is not that place.
The post-MAF tubes will give a little gain but not much. For a DD, not enough to make it worth what they cost, IMNSHO. But they do look nice - if that's your style, go for it.
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