If I want a lightweight car with a 4cyl I will buy a BRZ when you buy a BMW you pay a major premium and for that I want those extra 2cyl. The car might weight 50-100lbs more but for everyday driving, for the sound, for the smouthness, for the extra hp and torque and for the feeling I still want the extra cyl. They can look somewhere else than the engine to reduce the weight i.e: carbon fiber parts or lighter brake and many other option.
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