Turbocharging and supporting upgrades would add weight too. In addition to hurting MPG/Emissions and Reliability. Look at any and all hot hatches. Typically, they gain at least 200-250lbs going from the naturally aspirated engine to a turbocharged engine. For example; the Mazdaspeed3, Focus ST, and Impreza WRX.
A turbo adds most of the weight to the front of the car. In a hybrid system; a small motor is placed behind the engine, barely bigger than a turbocharger turbine, with the batteries in the back and low to better balance the chassis. Even if they only manage to add 20-30BHP for 200lbs, which is a worst case scenario, it will still improve the acceleration significantly.
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