Hey mate, no luck. I couldn't be f'd taking off all the belts, the power steering belt felt a bit loose so I gave it a tweak but nothing. I am pretty sure its coming from the timing train somewhere. Belt rub, pully or bearing. I have just had my timing belt done but like... 500km ago and its been quiet up till I take off the exhaust manifold . Makes me think its something I have done, but ummmm... Didn't work near that area.
Ive booked my car Wednesday to get it checked out. Just had a new engine dumped in so these sorta things have me on my toes. Ill let you know what he comes up with.
I am sure you have the same prob as mine, when car is cold its LOUD. Sound starts about 5 secs after running, slowly goes away after a few mins, will come back with minor revs till that slowley goes away and then only does it at high rpm.