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Alright, official weights are in:
Front OEM Caliper 3.0si (steel), w/pads 14.8 lbs
Front OEM Rotor 325x25 17.2 lbs
335i Front Caliper (alum), w/pads 14 lbs
Z4M Front Rotor 345x28 19 lbs
Total Savings -2 lbs
I added 1 lb on each front corner. I also saved 1.6lb per corner by going to ARC8 wheels, so this is almost a wash in weight, which keeps front unsprung weight in check.
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