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The catch can lines hook to the line off the back of the IM and the line that goes to the intake tube. Those then get plugged.
As for pressure in the catch can, there Isint any as the pressure releases from the filter. Also at no time does the crankcase suck in air, the filter is there to prevent any oil residue from coming out of the can. Crankcase ventilation will always be positive.
As for not running a can and dumping on the ground, that's a no no at a track, as no one likes sitting around while the track gets cleaned up from a oil down or while they pull a car off that hit a oil patch. While there Isint a lot of oil passed out in the event of a blown motor you would have a lot of oil release if you say melted a piston or blew a hole through it, which then you could oil down and run over with your rear tires and possibly crash.
If you go to a track day without a proper catch can and they see it they will not let you run.
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