Ok, so I got my AMSOIL air filter and installed it. Didn't notice any performance gain or loss (wasn't really expecting any... just didn't want to deal with cleaning and coating the K&N oiled filter).
Here is a pic of it side by side with my old K&N.
As you can see, it is longer than the K&N, and consequently has more filter area. This hopefully would compensate for any potential increase in resistance that this filter type might have.
It installed fine in my NA.