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How does it make more power? Your guaranteed to have unmetered at entering the system at some point if you have any kind of oil leak then your definatey not having more power. The restriction the PCV system makes at any kind of load only makes blowby worse, and once you have a simple leak on a gasket somewhere, your not pulling out any vapors, just cycling air.
My Saab 9-5 v6 has its PCV vented. After a long hard drive you can see the vapors purging at idle. Personally I cant imagine what kind of positive pressure is in the crankcase at WOT with the OE PCV system's small orifices. If you dont drive the car in cold weather I'd vent both ports and make sure you dont keep the pcv check valve use a coupler.
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