Smooth power everywhere

[VicsCB1100_imp]

Look at this another way:

The data Red Mist linked to shows a marked difference between the KnN and the Delco; the KnN let in over 17.5x the amount of dirt and the Delco had 1.37x the initial restriction. The data that I linked to shows 1.09x the restriction (I am too tired to calculate percent differences). I would argue that there will be some variation in initial restriction between different vehicles due to the cross sectional area of the filters. Different vehicles have different needs and expected air filter change intervals.

So, IF we NEEDED to increase air flow, an OEM could take a few different routes here:

1) Use the KnN and accept the inferior filtering but gain a bit of extra air flow (we still don't have any numbers to support we have gained any HP or that we needed to!)
2) Use the Delco filtering media but make the filter area twice as large. Now, we have retained the effective filtering and have very low restriction. How do you know that this isn't what Honda has done?

We could double the Delco filter area again to further reduce restriction (competent engineers would match a filter to air flow needs) but nothing we can do to the KnN will improve it's filtering effectiveness.
Interesting video showing sunlight shining through a KnN filter: http://www.youtube.com/watch?v=gNQ6d3ox5Ok

I can support the statements made in this link regarding filtration, both air and oil.
in a past life I was the sales and marketing manager for an Japanese OEM car manufacturer.

We had a real problem selling genuine filters against cheap asian imports and the established aftermarket brands. This was all down to price and perceived qualty of the aftermarket.

We asked a reputable university to conduct tests similar to the ones noted here and also had them deconsruct the assemblies to physically compare filtration mediums.

in a nutshell the OEM filters out performed all others by a substantial margin in terms of filtration efficiency, blocking dust or gunk and simply lasting the service intervals specified. The Japanese OEM filters had more layers, more surface area, better sealing and othe attributes. Ie. Over specified vs the service standards to compensate for in field poor maintenance by owners or extreme service conditions.

To ignore any dust entry into your engine is fraught with potential disaster. Dust is like a grinding paste on cylinder walls and also can enter engine oil.
Whilst I no longer have access to the results after retiring I would never consider non genuine filtration in any of my toys. For the sake of a few dollars why risk damaging many thousands of dollars of engine.