New to rs4

Hi,
Can anyone shed some light on a few questions that I have.

  1. Does the rs4 have a after run fan like the turbo cousins? I have a Apr supercharger and when I turn the car off the water pump that comes with the kit stays on for around 5 minutes but no fan. When you turn the air con on both fans run.
  2. Is anyone with a supercharger running a gruppe m intake or different filter and does it throw a cel? I have been told that it can play havoc with the load calculations.
  3. What other mods would you do, it has as I mentioned before a Apr supercharger and full miltek exhaust.
  4. My flaps on the rear muffler seems to be always open. I thought they are supposed to be closed when the car is off?
    Thanks,
    Marty