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Kind of an old thread, figured I'd reply anyway. The Z4MC that was run in Grand Am Koni Challenge in '08 was a full on race prep deal. I don't know corner weights, but overall it was around 2900lbs. And they had to add weight to it to meet the minimum weight required by Grand Am - I recall several rather substantial chunks of lead bolted to the floor on the passenger side. That was with no carbon or other stupid expensive stuff to make it lighter. Lots of stuff was stripped off the car.
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