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Just one exhaust hole... it means the car will probably be fitted with a 4-in line turbocharged engine, and displacement will be 1.8-2.2 litres. Smaller engine means lower weight and more space in the chassis to place hybrid system. This choice is to reduce the weight of the car, to fit the battery package as a ballast, placing it in the best way to lower the centre of gravity of the car as much as possible.
I think this choice can be the right one, to have a very well balanced car saving weight as much as possible.
Petrol engine is lighter than diesel one, so Porsche could be further advantaged with a 4-in line in confront of Audi and maybe Toyota (assuming they will preserve their 3.4 V6 engine).
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