Ok so for the most part we know that the baldwin PF7977 was the best fuel filter for the stock fuel system which is at 5 microns. But now it seems afe has been able to release a 3 micron drop in fuel filter. AFE Power 44-ff010 Proguard D2 Fuel Fluid Filter Meets 3 Micron Level for sale online | eBay I looked at afes website and didn't see any micron rating. I even called their customer support and the guy I spoke to (michael) said it is indeed a 3 micron rated fuel filter. So it looks like for those keeping the stock fuel system, afe is the way to go. Pro GUARD HD Fuel Filter. I am curious to see anyone who has ran the bald and afe and if they have had any issues with either.