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Sounds like it is time for a trip to the dealer. My 28i certainly doesn't make any unusual loud noises upon acceleration, only the expected turbo whine...but that isn't loud by any stretch.
Good luck!
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- Scott
Current Cars: 2019 X5 xDrive40i M-Sport, 2018 Camaro ZL1
Past BMWs: '16 528i, '00 M-Coupe, '14 X1 sDrive28i, '00 740iL, '02 325i, '99 M-Coupe, '00 323Ci, '79 323i, '83 320i
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