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E90 body is inherently stiffer than the E92, as evidenced by the lack of bracing around the rear wheel wells (even the E90 M3 does not have these braces). However, there is more to gain as the E92 was reported to be "20-25% stiffer than the E90" due to its additional bracing (eg front fenders, rear subframe). With that said, the E90 and E92 M3 more or less have the same bracing so I don't really see a point going beyond that. The E93 is apparently 30% less rigid than the E90, hence the need for additional bracing.
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