I have an 09 r36 which has or had similar issues:
1. Sounds like clutch packs but get it properly diagnosed. I had the same problem - first mechatronics and then clutch packs were replaced. The mechatronics made some improvement but the most notable improvement was from the clutch packs, so I would change that first.
Fixing won't be cheap.
2. What are the conditions of your discs - if the pads were changed recently but the discs weren't (they should have been), it can make some noises. But if it works I wouldn't worry too much.
3. I have the same issue with the Ac - haven't had it diagnosed so would appreciate insight.
Cheers
Nick
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NickZ
Former ride: MY07 Black Polo GTI
Current: MY09 Blue Passat R36 Wagon
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