Oiley Pipes

How much oil gets blown thro the chambers I have replaced both
intercooler pipes and there was a fair-old bit in the V6 side .This can't be helping the intercooler.Could you put a breather filter on the pipe to the air intake and lose this setup.Why does it go there anyway

a, as by law, emissions wise, there shouldnt be any spent gasses or vapours coming out of the engine, other than the exhaust, and b, it helps with the crankcase breathing of the engine under boost, as it is sucking the vapours through.