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If anything, I'd do solid engine mounts and leave the rest OEM if it were a street car.
Poly mounts are a PIA since they are sensitive to torque. Too much and you'll get lots of buzzing and then they'll snap off.
Say what you want...I call bullsh1t when people say they torqued them down. Ain't to way to get an smooth and accurate pull on a torque wrench connected to extensions and flex joints. Who has the proper crows foot to torque the top nut on the trans? No one.
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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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