The K47 option does not flow air better than the standard, it just holds more dirt before becoming restricted.
As my photo shows, the bigger element is intended for "severe dust conditions".
It holds more dust because the pleats are deeper. The deeper pleats means more surface area of filter media.
More surface area should translate to "better flow", except that it doesn't take much of an air filter to flow all the air an engine needs--
when it's clean. As it plugs with dirt, more area is a good thing.
And I don't trust that air filter indicator thingie on the Vortecs one iota......
Those air filter restriction indicators are used all over creation--cars, trucks, bigass diesel City Buses, semi tractors, construction equipment.
They're pretty-much the "gold standard" for detecting a plugging air filter.