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On the horsepower saga:
The f30 platform (debut 2011) has a much improved chassis compared to the e90 platform (debut 2005). The f80 is, by dint of lightening, offering another ~18 hp through weight reduction.
The area under the curve of a vehicle with 33% (33%!!!) more torque is substantial, and the f80 m3 is supposed to have 70% more torque at low rpms (i.e. 2000). This is just all sorts of new power.
At this level of torque and output, a greater limiting factor is traction. It SOUNDS as if with the new chassis and stiffer diff mounting, the f80 is going to have greater traction - this means HP for HP the f80 m3 is going to accelerate more efficiently.
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