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Let's not forget about all the heat those turbos will generate on the track. I remember reading about the early 335i's having problems overheating and going into limp mode; the new Z will need a fairly efficient oil cooler for anything more than a few hot laps.
The new Z's brakes will also generate more heat because of the greater amount of kinetic energy dissipated (from the greater mass). Up-sizing rotors will increase unsprung weight, further degrading handling (already adversely impacted by the E89's greater weight). So, modify the suspension for the track. Suddenly you have a car you paid $60k+ for with a voided warranty and special-order parts that must be serviced by a professional or knowledgeable DIYer. So much for that "free" maintenance incorporated in the purchase price of the vehicle, or the ability to have your car serviced at any dealership.
Then there's the LSD, supportive seats, and fun-to-drive factor... take the M.
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