Might mouse can uses the stock oil cap. A line runs from each valve cover to it's own port on the bottom of the can. The can has metal mesh in it just like an elite. There is a blow proof metal PVC valve at the top of the can. You run a line from it to the intake.
The top cap screws on and there is a thick rubber diaphragm under it. Under normal conditions, the diaphragm is closed. If you are making enough crankcase pressure, the pressure forces the diaphragm edges up and it vents it to the atmosphere.
If you are running a centri blower or a turbo, you also run a line from the valley cover to the air filter or otherwise to the centri/turbo.
It only vents when necessary and is otherwise a closed system til pressure makes it open.
Other threads about the MM can:
http://www.camaro5.com/forums/showthread.php?p=7019872
http://ls1tech.com/forums/forced-ind...catch-can.html
http://www.camaro5.com/forums/showthread.php?t=310144