Suprgnat, you've made a great meticulous thread and you have a lovely car!
I also have the HPA M3 strut brace, did you notice any extra rigidity since triangulating it?
I've only seen images of 2 cars with triangulated M3 braces, yours and a 335i with a Dinan strut brace welded to the M3 rings. That also had the Dinan carbon stays in place of the factory M3 aluminium ones.
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