I would note that according to the Dynojet page referenced, the PCV works on the SF at low RPM and throttle positions ONLY if you have a DP ECU, as is supplied with the either the carbon (not the titanium) Termi slipons, or the full system in the US. This implies that the DP ECU supplied with these systems bypasses the Lambda (oxygen) sensor inputs, even though they are still mounted in the exhaust, and connected to the ECU. Thus the PCV is able to fully modify the fuel mixture even at these low RPM's/throttle openings with this ECU in place, because it is always running OPEN LOOP.
No catalytic converter => no need for closed loop operation.
im not sure that the "open loop" operation applies for the slip-ons as well.
it can definately running open loop when it comes to a full termi with DP ecu but thats not for sure when a slip on is installed.
i had a kawasaki with FULL akrapovic RACE system with PCIII usb installed and it could work both in an open or closed loop operation.
If i wanted it to work as an open loop and map full RPM width then i should remover the O2 sensor and install a dynojet O2 sensor elliminator that came as an add on.
If i did that, then when i was driving with constant RPM over 5.000 then the FI indicator lite up! Thats was definitely a con but the benefits from the open loop operation was so many that i didnt care so much...