I think when people choose inductions kits, unfortunately the last thing they actually consider is actually how well they filter air, and moreso how much carbon shield they have, how colourful they are or their power claims by manufacturers. I chose a JR filter purely as they were TUV approved, and filters down to 5 microns (from what they say), purely with engine longetivity in mind.
I could be pulled in by marketting gimic's, and in actual fact cheaper induction kits will filter equally aswell. I guess we just don't know these things unless someone independantly tests them.