The F30 328i is 88 lbs less than the previous generation and since BMW and all other mass auto producers rely upon economies of scale it would not make practical sense to make the F80's chassis components out of different materials. With this logic and the use of CF for the roof, hood, deck lid, drive shaft, and maybe doors along with more use of aluminum and magnesium components and carbon ceramic brake rotors (60 to 80 lbs savings alone) it would be reasonable to get the F80 to 250 lbs under the current M3. BMW could throw us a big curve ball and make the entire chassis out of aluminum which could result in the same overall weight reduction which as we all know many of mass producers are doing now (Audi and Jag). I'm betting on a new 3.5 Liter in line 6 all aluminum twin turbo with 450 HP and 450 ft lbs of torque.
2011 M3 Sedan
Dinan tune, intake, pulley
265-35-19 Hoosier R6's
for the track with Carbotech pads