that is the way i have it piped.through avas experience they can fill up and dump oil through the vent pipe onto the road.the top pipe which goes into the rocker cover should go into the block underneath the turbo and the bottom pipe should go to the sump below the oil level.as it is lots of oil can come up the rocker cover pipe and as the whole system is under crankcase pressure the oil cant return to the sump under flat out conditions.that is avas opinion through past experience whera a cossie dumped most of its oil on the dyno room floor.
as for the turbo,its a t34 with a .48 housing,the wastegate hole is too small which was making it overboost resulting in a high bhp reading,ava will cap the power to around 300bhp when the housing has been replaced,and the rest is usual stg 3 spec!