Im running the GGR/Tarcal item and Catch tank, plus threaded unions and stainless braided hosing, it weighs in at somewhere in the region of 8-900 quid

I have removed the flame trap it breaths from both sides of the block, to the top of the breather, the bottom of the breather returns to sump (modified) below oil level, a third port on the top of the breather goes to a catch tank on innner wing this vents to atmosphere below the car....

for extensive pics see the link in my sig ... I would also search this subject using the search option as its been discussed quite a few times