[oldman]

yep there is some minimal amount of pressure that builds up to vent. At or near WOT and especially with FI there is NO engine vacuum so the PVC is NOT working. The exact same amount of air is being moved in the crankcase as being ingested by the engine at WOT, even more, is being moved part throttle. This movement of air causes pressure waves, I honestly done know what the PSI or Kpa these waves are, but I do know the factory PVC does not function at this point. When will I blow out my seal? At or near WOT, what will prevent that? Many and large holes to the atmosphere, preferably at the top of the engine.

PVC at part throttle, I assume parts of the engine like the top valley are under a slight vacuum, I would assume places like the top of the valve cover to be at atmospheric. How much dunno, but the factory PVC hose is tinny. the oil from the cans when settled look reasonably clean, so I don't know how much cleaner engine oil will stay with a functioning PCV vs vent. Assuming that PCV "pulls" out say 2 oz more oil over 8,000 miles vs vent (got no idea).

Racing, I don't know of any race cars that have a "passive" PVC, especially FI. I do know of some that run mechanical vacuum pumps that actually increase their draw with RPM. https://www.summitracing.com/parts/cvs-vp625

There are track rules that require that oil / oil vapor be caught vs dump, but these are safety rules, not performance rules.