I was just giving my car a once over be for a remap on Monday when I found a boost leak in the PCV system under the inlet manifold. Pic of area (pipes removed) No real issue I though so I bought some new pipes and a new non-return valve that sits in the tee piece as the old one was leaking. However, the new non-return or check valve also does not hold pressure in a simulated boost situation (my gob blowing into it ). Also checked with a mates valve too, same result. This is a constant boost leak in my opinion which allows boost into the PCV and a badly designed weak valve. So now I'm thinking of removing this valve altogether and only allowing crankcase gasses to vent into the TIP. I can't see the point of the small pipe to the inlet anyway. Anyone else tried removing the valve? Thanks.