It's Giubo.
You shouldn't have to take the manifold off to remove the exhaust.
I would check your rear suspension before anything else. Rear Shock Mounts, Rear Trailing Arm Bushings, your bearings might be the cause of the 'whir'.
In fact. Read this: https://www.bimmerfest.com/forums/sh...d.php?t=220181
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Quote:
Originally Posted by EnserioJose
Sorry. I'd imagine Seattle is a-hella-nother country.
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2005 X5 4.8is Le Mans/Black/6spd Steptragic 
1999 M3 Cabrio TiAg Metallic/Dove Grey/Black 5 Speed Manual
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1997 328iC Schwarz II/K/K 5 Speed Manual SOLD 5/2012
2004 645Ci Mineral Silver Metallic/Black 6 Speed Manual RIP 04/2011
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