I think having a factory turbo would require some extra components to make sure the car has enough stopping/handling power. Maybe that wouldn't make the car much heavier, either
Food for thought: 2 similar cars are the 228i (~1478kg ) and the M235i (~1590kg). They add 1 more liter in the engine, better brakes, etc for only ~110kg with the upside of having a lot more power and torque (I believe 228i has 240hp and the M235i has 320hp, right?).
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