Hi all, I am hoping that someone can easily identify what noise this is, whats caused it and what problems its going to cause. The noise is easiest to hear at about 11 seconds when it revs up, the kind of bubbling noise. When i'm actually driving, its much easier to hear, but harder to record. It's been happening for about 2 days, possibly getting worse.
http://www.youtube.com/watch?v=uD43pWw2s3k
Almost forgot, the car is a series 3 AU falcon, with lukey exhaust, and some extractors (not stock, possibly pacemaker?). These were add about 3 years ago.

Sounds just fine to me

All i can hear is ur exhuast

It its coolant level a bit low?

Perhaps the sound is water and air going through the water pump.

Yea after listening to it again, you're right, its too hard to notice from that clip to hear the noise, I guess I am more used to what it normally sounds like, it's much easier to hear while driving. Anyway, on the way to work this morning, it got much worse, so I dropped it off to get looked at. Was just a bad spark plug, the electrode was almost completely gone. Iridium spark plugs my a**, only lasted about 20,000K's.