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Some of these catch cans do recommend removing the innards of the PCV valve. I don't have this installed, but I would follow the instructions, being careful not to crack the plastic PCV fitting when removing and reinstalling.
I would save the spring, piston, and retainer in case you want to reinstall them. I would not drill out the valve, as i believe that is only for high flow situations like modded vehicles.
And it is a pintle, not a piston, but whatever.
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