Originally Posted by TerraUnFirma
From the looks of the mesh, it's way less than 50% open space, so putting it on the 3x3 opening might reduce it to more the equivalent of a 2x2, which is 4sq" vs 9sq"...not good at all. There is enough area when you've got it spread over the entire air filter that it's probably no worse than the air filter itself...not so with the 3x3 opening.
theres no way that filter would restrict the airflow by more than 10% over the 3x3. it certainly hasn't droped power and fuel econmiy is as good as ever adventure riding. IMHO