I know, my sarcasm was over the top also. My point is/was the same as the last two posts. I want the best filtering possible, if I didn't know better then no harm. I have bought three K&N's over the years, I didn't know of the poor filtering until last year, I know better now.
For race cars which have oil changes a little more often than 25,000 miles(sarcasm), no difference will be seen. If actual testing was done of race cars and the oil by mandate had to be used for 25k or a year, someone would discover the difference in the oil quality between air filters.
I'm just trying to help, given the cost of fuel and oil and engine work, more life from a simple part is good information. In the end it saves money, that is the goal I hope. Regards,