the scrims minimize the dust on the inlet side. similar to the scrims used in the JJ
Yes the Kiss o2 MAV is an integrated MAV/orifice. So when you take that off, you just drop the fathom needle valve in. Kiss has numerous "prototype" needle valves that they wont actually sell to anyone not on the special list.
I didn't realize that the orifice was integrated into the mav. I just assumed it was separate. I've heard about the secrecy behind who can get a needle valve. That's why I planned to just use Charlie's. I'm sure I can live without a needle valve, but since it's all I know I'm accustomed to it.