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have you driven your car since youve installed that catch can, with that one fitting open? If you have then you would have noticed the increased spool up time, vacuum runs through that line via the pcv system, if it isnt connected then you will run slightly leaner than normal, it is basically a big vacuum leak, plus when you are at higher rpms the pcv closes and the hose leading to the intake now removes pressure from the crankcase along with blowby gasses. Pressure in the crankcase is bad. Basically what im saying is connect the catch can properly. Oh yeah, even though the nipples on the can are right next to each other doesnt mean they are both open right there, the inlet has a turndown tube i believe so that no fluids go into the intake.
-Phil
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