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BMW has offered explanation to a few magazines I read (PBMW etc.).
The M6 has a longer wheelbase ever so slightly; making it more stable in corners.
Mainly, the M6 has a smaller front area. The Z4 had excellent downforce but was limited to top speed on the long straights such as Daytona.
By switching the to M6 they were able to hone aerodynamics to allow for greater speed.
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