Well, I got new air filters. They were about due, and while doing some shopping on Amazon, I decided to get a couple K & N filters. I have been told before "don't waste your money" "just buy the paper ones". And for whatever reason, I ignored it.
So I wanted to check and see in the logs what the difference would be. I was a little surprised. Below is a chart of MAF and RPM, identical runs, engine warmed up, ect ect.
I think this is enough evidence of why NOT to waste your money on the K&N's. I was really expecting to see a little improvement in MAF. But no.