Idle Squeak sound (Not crickets)

[EquiFox]

So yeah the car has been doing this for a week now, its def more noticable now.

Any idea from where it could come from, before I take it for an appointment ?

This was recorded from inside the cabin without both windows up, you can usually only hear the supercharger...

Also 2nd question, if my exhaust tips are full of black residues, it's means im running a rich right ? Cause while at a light yesterday I gave a tiny bit of gas (Like to rev from idle to 2000rpm) and it popped like a backfire but the vibration was underneeth my feets O.o so I was wondering what could have caused it (Car is running fine anyway)

[ame]http://www.youtube.com/watch?v=izzp4JDJ_cw[/ame]

(Sounds is better with a headset it seems)

Thanks

[Packofcrows]

sounds like pulley.