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I had a similar experience with my 2011 Z4 35i. I noticed a whining sound for a while and then when I was out for a drive, it became a very loud screech whenever I accelerated.
Getting these turbos replaced is like open heart surgery for the car. They have to drop the drive train and tranny and remove the engine.
My current Z4 has, after a few months of ownership, had a slight whine but it hasn't changed at all after 22K miles.
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2016 340i XDrive, EBII/black, 6 MT, M Sport, Track Handling, Cold Weather, Tech, Lighting, Driver Assistance Plus.
2012 Z4 35i, ED 2/24/2012, Melbourne Red Metallic, Black Leather, Carbon Trim, 6MT, M Sport, CW, PP, PS, NAV, CA.
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