Not at lot of applications for this site, but if you have other hot rods, may be of some interest. The Ea air filter elements are now being used in a new way.
Here is the data sheet:
https://www.amsoil.com/lit/databulle...30_rev6_07.pdf

 

Most of the big HP diesel's run these breathers. If your runnin High HP and high turbo pressures these trucks will build a good amount of vaccuum, it just doesn't create it for long periods like gassers do, so it's not a problem for us normal folks.