It appears to be identical to my filter except for the extra wrap on the outside of the filter itself. I guess that means that I have the heavy duty air cleaner. I believe the "tear drop" air cleaner style that I have has the potential to allow more air flow to the engine with the filter being the limiting factor. That said, I don't believe that my engine will ever see the air flow limit of my air cleaner or the air filter's maximum flow limit.
1981 F 150 Custom 300 ci with a fully rebuilt 1968 240 head Carter YFA T-18 3.25 9" rear 2WD
dual gas tanks
1990 Lincoln Town Car 5.0 AOD
Home town Mc Kenzie, TN