Through research and talking to some bros, utilizing the suction of the turbo, which gives you slight vaccum is more healthy than equal pressure to atmosphere. The oil returns on the turbos will flow ever so slightly better etc. This is why RX & URP utilize this suction in their catch can designs. Both companies use McNally CSS. Yours is probably fine but utilizing the suction is the best for the turbo seals and piston rings and possibly 1-3% better performance (1% or less on our power level 3% with 1500hp)