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Originally Posted by bradleyland
How much weight savings do M-mirrors and CFR deliver though? IIRC, the roof is about 12 lbs, which isn't really moving the needle....
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Stringing together a bunch of minor weight savings that don't "move the needle" on an individual basis is the most common way for engineers to drop a ton of weight from a car. So when BMW don't use a CFR with the M2, we can infer how seriously they treated weight savings when developing the car.
People point to the CFR as a line BMW drew between weight savings and cost. If they didn't bother with a CFR, what other weight saving techniques did they also leave on the table?