Converting to LS6 PCV worth it?
If you're good at what you do, I'm sure you don't NEED knock sensors, but dammit, aren't they nice to have when **** doesn't go according to plan?
As for closed loop catch cans... No, I don't mean it should recirculate. But it's in a sealed container, just as sealed as anything else in the motor, and the contents are emptied in the exact same manner as the oil pan, so why would the EPA care, at all? Sure, no oem vehicles come equipped with one, it's still not to say that it's not a good idea. Very few oem vehicles come equipped with vacuum pumps, but they are fantastic and even your lawn mower could benefit from a vacuum pump. The reason oem vehicles don't have these items is cost, not effectiveness.

