I cannot imagine the car dropping 220+ pounds. That is A LOT of weight. I remember yanking my evo apart and cutting bolts shorter and removing crash beams and still only got about 95 pounds out of the car. With standards from the government, if the car loses weight I would be impressed.
Remember, with cheaper parts comes louder road noise, humming and other annoying things that the M3 currently does not have.
If they do manage to lose 220+ pounds, they would have to use MORE carbon fiber... More CF = more $$ I will take a bump in HP over the drop in weight.
2013 GT500 + 2006 E90