Just curious, but those of you with some sort of cold air, how big is the filter in the fender?? Im looking under there, and i cant see stuffing more than a 6-7" filter in there... is this about what size they come with?? Seems almost not worthwhile, if the filter is so small..ideas? opinions? What do you guys think is better, the fenderwell cold air, or the huge 12" filter with a heat shield??