Jumping in a bit late here, but what is the condition of your tires? That could cause a grinding feeling when turning if they are excessively worn, flat spotted or unevenly worn.
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2012 E92 M3 | ZCP | DCT | Space Grey Metallic | Black Novillo | BE/ARP | MPE V2 | AA green filter |BMW CF Rear Spoiler, RW Carbon Diffuser, CF Front Splitters | DTEC 160W Angel Eyes
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