I installed poly subframe bushings in my E46 and there is no discernible increase in NVH. I think the biggest NVH adders will be any poly or solid driveline mount.
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2018 F30 320iX Melbourne Red
2011 E90 M3 Monte Carlo Blue
2004 E46 M3 Imola Red
2000 E36/7 Z3 Steel Blue
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