E30 M20 2.7 turbo breather system

[Rallyprep_UK]

What have others done with regards to the breather system on the M20 turbo setups ?

I have an M20 Turbo E30 here and I am pretty certain the breather system is incorrect.

Thanks in advance
Will

[b12rlw]

Rocker cover breather on mine is fed to a catch can with a drain valve that feeds back into the position where the oil level switch used to be.
Rocker cover has been tapped to take a barb hose fitting.
I do have a custom intake manifold though.

[ross2009]

the inlet on the side of the throttle body needs blocking off other wise it will take boost and pressurise the crank case, rocker cover can just have a little filter on it or lead to a catch tank thats it