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I have read some BMW literature on their superior pleat design allowing tremendous surface area of effective filtering media. Its kind of hard to argue with the advantage of surface area. Surface area is your ally when it comes to air filters, radiators, intercoolers, heat sinks, pool filters, etc, etc. If it were superior to just use a simple one sheet membrane, everyone would do that. But the fact is, everyone goes through the expense of constructing these elements with more surface area for a good reason. As far as my 15 runs comparing my K&N vs Stock filter, I will make some more runs and then put the stock filter back in and see what happens. If there is any indication that the stock filter increases the overall HP, then I am leaving it in.
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