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Before you go crazy replacing this and that with regard to suspension and mounts, consider the obvious variables that may be contributing to the difference.
When I went from worn Contis to an RS-3 square setup (on my '08) it felt like Adrian Newey re-engineered the suspension and balance.
Everything that you describe save the groaning noise in the cabin (?) could be attributed to tires.
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M4 GTS, GT3, C63 S | E90 M3s, E39 M5
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