Help regarding open type air filters

[bratski]

I’ve read somewhere that by installing an open type cone filter you would lose low RPM torque but gain top end HP? Is there any truth to this? I’ve recently installed a simota open type filter and noticed that at low rpms the engine lost some “pull” but at the same time I get better fuel mileage. I then re installed the original airbox and filter after a month as most of my driving is around town. What I have known is that when you get more air in the engine it gets more power, but how come you also lose low end torque?

[ghosthunter]

Open type filters should increase hp/torque in the entire rpm range.

Reasons why you might encounter power loss:
-intake is ingesting hot air from engine bay
-resonance in the intake tube/path between the filter and engine.
-"seat-of-pants" feel might be misleading because of increase engine noise (due to open filter)