Hi can anyone advise me what size the breathers are on a v2 Impreza as I want to fit a catch can but don't know what size Inlets to go for, or does it not matter?

 

I had my can made by OBP using these dimensions, The two smaller spigots are for the cam cover the larger ones for the block breather and VTA

OBP made one of their "new age" baffled cans with 12 and 16mm spigots. I chose the new age one as it had a mounting bracket welded to it.
Car is V2 STI RA.

 

Not sure of the exact size, but the crank breather outlet on the block on my car is around 18/19mm