I'm looking to replace the air filter on the '06 and want to keep the stock air box. Which one is best for 1) flow 2) filtration. I don't like oiled elements so I'm looking for a good flowing, efficient non-oiled air filter. I like the cone AFE unit for the stock air box b/o the larger surface area, but AFE is known more for flow than filtration effeiciency. What do you guys thinks?