There is something people are overlooking with the i3 and i8 is that their respective weights are actually significant because they are individually developed models for a purpose.
Now with other manufacturers adapting electrified powertrains to current models their weight goes up and it is not a minimal increase.
What is signifcant for BMW is that they started the CFRP process very early so they took the initial expense hit early now that is in production of a reasonable volume for the M3 and forthcoming M6 Coupe's. BMW M can actually fit the CFRP cost-effectively now to these models.
If Audi or Mercedes-Benz had to do so on the RS5 and C63 respectively they would be more expensive.
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