Hi KOHO, you're going to be a member soon at this rate.
Here's what i think -
Performance
Mugen is obviously more restrictive, and probably provides less filtration than the stock filter (not critically low though... you'd hope). Due to the more 'free flowing' nature of the mugen, it's more likely to produce better throttle responsiveness over the stock filter, but it will be barely noticeable.. You really need to blind test someone for this.
Soundtrack
A filter produces no sound muffling properties, and therefore changing it will not have any effect on the sound ur car makes! That's why u probably dont notice any difference in those videos you took.
The air filter only represents a tiny portion of the overall restrictiveness of the air filter, which probably explains the minimal difference.
Other options
If you want genuine throttle responsiveness and sound, pull out your resonator hoseIt's like day and night! The stock intake runs under the battery and to the right of it.
Pulling the hose out:
a) shortens the intake length (try sucking through a long straw and a short... there are a lot less frictional pipe losses)
b) essentially 'removes' the resonator, which adds a LOT to the overall restriction of the intake pipe, and makes a big difference to the sound
c) changes the optimum RPM for the ram air effect.
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