Breathing in oil mist increases the likelihood of detonation on an engine tuned to the max.
A catch can eliminates this.
The engine likes to have negative crank case pressure to aid smooth running. This is achieved with the standard oil breather system and the one way valve on the intake.
These are the facts. You decision can now be made.
I run a catch can on my racecar but don't like them on road cars as they tend to transmit an unpleasant hot oil smell through to the cabin.
The oil mist is only pulled from the crank case at very light load (negative
Manifold pressure) where the engine isn't det limited, so I am not convinced adding a catch tank adds any benefit on a lightly boosted (<1.5bar) road engine
I managed to get a look at a RIPZ RB30 breather system and that was very interesting. rob makes a point of not using a head drain.
His solution is to vent the sump just below flange level into the top of the catch tank with head vent also into the top, then he runs a second drain from the bottom of the catch can into the sump with a second fitting.
It's a setup I will be copying.
I have always thought the reason why head drains work is the allow the bottom end to vent (hence such large fittings need to be used) Robs solution tackles the routecause of the problem.