I wasn't involved, but I don't think that's true.
Looks to me like 193hp (double vanos engine) * 1.3 (30% multiplier) * 11.25 - 25lbs adjuster (no idea why, the other Z3s got -50 lbs) comes out to 2798, rounded to 2800, which is the listed weight.
If I start with 189hp (single vanos engine) I can't come up with any math that comes out to 2800.
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