The idea of the pods and volocity stacks is to be out in the open where they can draw more easily plus the air travel distance is shortened quite a bit=better air flow.
on the 550s at least, the connectors from the airbox to the carbs seem actually have a slight taper to them, potentially creating a venturi effect as the air flows from the airbox to the carbs, kind of like little velocity stacks. i'm no engineer, and certainly no flow expert, but i've seen this argued in better detail. i always thought that the stock filter itself was a big part of the restriction issue.
i have pods because they make the carbs so goddamn easy to get off and on, but i really believe that the "better" air flow is probably not actually better. i say go for the suggsted mod and let us know how your plugs read.