I noticed that K & N will soon offer an air filter for us at a price of around $100. Unfortunately, I was not able to find performance data to justify such a purchase. They did offer a video of a guy who said his car "felt" stronger after installation, but that was all. Have any of you run into information that might be helpful?
It's not all about the performance...
You don't have to replace a K&N filter. It should last the lifetime of the vehicle.
So it saves money over time and the dirty filters don't get tossed in a land fill (if that's your thing).
However, there have been rumors regarding the 'filter-oil' coating the MAF electronics and potentially causing issues.
Don't know if they are true but, even though I used to use K&N's on all my vehicles in the past, I haven't installed one in either of my current vehicles.