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Originally Posted by CanAutM3
I think the point is that they still had to re-map the "base" 473hp tune of the S58 to reduce the torque output versus the tune used on the X3/4M. So why not take the opportunity to raise the redline a tad in doing so.
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That's a fair point, sure. But as you know, generally speaking, the faster the parts move, the more stress they endure. So, it's not a "free" mod from engineering perspective.
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Interestingly, the power/torque chart in the S58 technical document shows values for the S58 up to 7,500rpm. All that being said, BMW certainly had their reasons to keep redline at 7,200rpm for the 6MT.
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They did, and to me the simplest answer is the most probable: it would have costed more to increase it.