It's funny you bring this up. Very recently I was talking to a BMW geek and racer, who tracks an E46 and autocrosses his Z4. I mentioned thoughts of tracking mine and he said it wasn't the best platform for it and that he preferred the E46 for track use. One big reason was the wheelbase difference. So when you posted this I looked them up.
E46 M3: 2725mm
E86 3.0si: 2495mm
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