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I know this is a little different but in my own personal experiences with open air filter vs closed air filter and whit the add of my trusty SAFC and butt dyno theres a a very noticable difference between the two.
Heres a lil something quoted from K&N although they are talking about air horns and velocity stacks without filter it still may apply atleast i know theres a difference between and open air filter exposed to outside high speed air vs a closed air filter boxed in a housing which has no high speed outside air to interfear with induction.
Scroll down to "Racing" and read.
http://www.pickupspecialties.com/KN filters/K&N_facts.htm
Heres a lil something quoted from K&N although they are talking about air horns and velocity stacks without filter it still may apply atleast i know theres a difference between and open air filter exposed to outside high speed air vs a closed air filter boxed in a housing which has no high speed outside air to interfear with induction.
Scroll down to "Racing" and read.
http://www.pickupspecialties.com/KN filters/K&N_facts.htm