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The new M850 also has the same exhaust sounds. I believe it is related to the deletion of one of the resonators that enhance the sound as compared to an M550.. On an 540 six, I' m not sure if that alone would do it.
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2018 M550iX-Dinan Stage 1 | 2011 E93 M3 Convertible | 2002 E46 M3 Convertible | 2002 E53 X5 3.0 | 2000 E39 540i | 1998 E36 M3 | 1988 E28 M5 | 1987 E28 528i
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