Re: k&n intake problems
Volumetric efficiency is the prime consideration when you're talking about cylinder filling on a normally aspirated engine, so you're correct to a point that a higher flow filter can assist in a better VE. This is where the more flow = more power gets it's basis.
However, the gains claimed by K&N occur at rpm's well above the H2's operating range- so they don't really matter. It's akin to running a 4" fuel line from the tank to get more fuel to the motor; you're never going to operate it at that flow rate, so it's unnecessary.
The downside to the K&N filter is that it will pass more dirt while not providing any usable performance gain on the H2 since you're not going to operate it in a flow range above the stock filter anyway.
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