The question is - how will this impact the performance/feel of the car on the street; i.e. are these increases in stiffness/spring rate etc going to be detrimental to every day driving feel?
More on that from me in October.
Regarding 601M being forged vs not - there was some conjecture that they might not be based on some literature someone found elsewhere which referred to 343M directly as forged, but 601M just as "light alloy".