Originally Posted by 2012AccentSE
Ford recommends that the bypass be on the open end of the filter to prevent phaser knock at startup. I have used the 820s for 95% of the time on my 2008 King Ranch 5.4 3v. No issues running it, however, I admit that I have never cut one open. I bought them in bulk and have about 4 more to use. I have used clearance Puro One's and Puro Synthetic filters that are very good, however I did notice some noise at startup.
I thought the ADBV prevented this from happening? I've already bought some Wix filters, but may have to rethink that if they will cause phaser knock.