OK, forget all the advertised power gains of the common filter mods. Does anyone know the surface area of the K&N drop in filters vs the aftermarket such as the cone type?
Also, I haven't looked at the stock box but it appears that most cone type filters just send the air into the stock box which depending on design might not be the most free flowing. In fact, many are designed to reduce noise and are quite restrictive. Putting a fancy filter on such a box does nothing.
Without taking things apart yet, are any of these aftermarket filters A) known to have more surface area than the stock ones, B) employing any type of smooth free flowing intakes?
If bike upgrades are like car upgrades which I assume they are, it wouldn't suprize me to see filters costing hundreds that do a worse job than a set of K&N drop in types and a drilled air box.