I performed simulation and testing of HVAC systems once upon a time (google DARPA Immune Building).  Needless to say, there is no free lunch with air filters, even with fancy engineered synthetic fiber media.  At the scale of a motorcycle or automotive air filter, there is very little gain to be had as far as flowrate vs pressure drop by switching materials at a constant particle removal efficiency.  The only ways to make real flow gains are to a) increase filter area, b) increase pore size, c)