Why is this a "racing only part"? I remember with the E46, the rear camber arms were made to be flimsy on purpose. If there is an impact in the rear, you'd lose a camber arm with the flimsy OEM version...it was designed to bend.
When you installed something more significant, the rest of your suspension (which costs a lot more), subframe, and rear end would absorb the impact. From the looking at the rear subframe, that would be my guess here as well...the OEM toe arm was made to bend under an impact.
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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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