Hi, sorry to bring an old thread back alive. I've just bought a set of Porsche brembo 996 calipers front and rear that I believe you can buy adaptor brackets for. They definitely fit on the non-M e46 and since the 330i discs and calipers fit the z4 then I hope it's a straight swap on the fronts, maybe a little machining required.
I have fitted an E46 M3 full rear axle and LSD so the rear brembo calipers should fit also.
Al
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