I have 2 Mustangs that have K&N conical filters on them. I want to switch over to another type of oil-less filter. What brands should I be looking at? Before everyone suggests to go back to stock filters, one car is Vortech supercharged that requires a conical style filter, and the other has a fenderwell style intake. Also, I have never oiled the K&N filters, as I fear oil will ruin the MAF's. Just looking for something better if thats possible