The new M3 weighs more because the base car is bigger than the outgoing coupe. They at least used weight optimization to ensure it had the best CoG and don't forget, the weights used for the M3 are the EU standard, whilst the Audi's aren't, so in real terms, the M3 is lighter than the RS4, which is what matters, when you consider that car is based on a seven-year-old design. The M5 touring is lighter than the RS6, which at over 2 tonnes, shows no weight reduction efforts what so ever.
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