Yea I was just looking into the filters and there is the fl820s listed above and a fl400s. I thought the fl400 was for the 4.6 and the fl820 was for the 5.4 but the website said the fl820 also fits the 4.6. Idk though maybe someone can chime in.

 

I'm a Senior master ford tech, never seen a 4.6 with any filter other than the 820

 

Ok great! Thanks!