Ej257 is still semi-closed. There hasn't been a fully closed ej motor since the ej22 iirc. The newer semi-closed motors, though are nearly as strong (strong enough for production) and offer vastly better cooling. Better every day performance/value for the average consumer at the expense of insane (unusable) numbers for the 3 people would do it.
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While a standard engine is powered by a belt connected to the crankshaft, a turbo engine runs on its own exhaust steam, making it more energy efficient. -- CNN
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