[rcoe]

Well learning more about catch cans than I thought I would ever need.

For all the newer (2020) MM catch can the center section is rotatable and can change what ports do what.

There are 2 different exit ports depending on application that should go back to the intake manifold or vac. source. This should have the check valve fitting.

The other is just a hole where you can see the metal media inside, this is the inlet from either the crankcase or valve cover. Open fitting.

Mine have been backwards. This might not completely solve my issues but would help to at least have it plumbed correctly. MM also says for track use I need their sealed cover and to have it setup as a mild.

Will try this, hoping this might fix it so I don't need to by new valve covers.