done some quick changes to DIY catch can...
Using an ebay catch can now (still very small, and with quite small bore inlets! BUT i have used some 22mm reinforced hose (same as Skyline) for the breather pipes (but had to reduce to meet catch can etc) This should slow the airflow/oil vapour down once/if it comes out on track - meaning hopefully less oil wasted in the can
and and another look at the discs on the Impreza.... oh dear. Good job we towed that car home from the last trackday, as the brakes felt warped but there were no visable cracks at the track (must have happened when cooling)! 2 cracks clean through the O/S disc, and 1 on the N/S.
Front Brake spec
Standard discs using STi 4pots, Carbotech XP8's and a brake MS booster
Need to look into going bigger I think Snetterton would have done the damage, and Crail just pushed them over the edge.