Oil Catch Cans

"Catch Cans" are used to allow the crankcase to breathe.  The natural operation of the engine creates a positive pressure within the crankcase by some amount of combustion gas/air to seep beyond the rings.  There is also a natural force acting against the piston rings as they travel up and down the cylinder bore.  During this time, you want to remove as much pressure as possible from the bottom of the rings.Allowing the crankcase to breathe has many positive advantages which most PCV systems are not designed to handle from a performance aspect (especially once you add forced induction: Decrease in blow-by increased ring seal less opposing pumping forces under the pistons opportunity to run low tension rings for increased power output lesser opportunity for crankcase pressure to create oil leaks such as oil pan, front and rear main seal   EXAMPLE:Lets be a little exaggerated so you get the idea.  Inflate really anything to its maximum inflation.  Hard to push it right?  Remove half th