Originally Posted by chriszeh
id like to have -400. that would be a non gimmick i could really get excited about.
If you add up all of the fairly special weight savings they put into M cars, it would probably be enough to get you excited. Carbon Fiber and Plastic panels, extensive aluminum in the suspension, lighter engine, full stainless exhaust system. Most of these BMW doens't put on the non-M cars and most non-BMW cars don't have any of these. Sure, the M3 is fairly heavy compared to pure sports cars, but it is also an incredibly stiff, solid, quite, sedan that fits four relatively comfortably.
Compare the weight to the C63, also a nice car, or the CTS-V or the Audi RS4, etc. I think the M3 probably averages over 300lbs lighter than those cars.