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Dave it is for non turbo gas and diesel engines. A super Charger will also do what a Turbo does but at extra fuel use because the super charger is driven by the engine unlike a Turbo which is driven by exhaust gasses.
Engines without super chargers or turbos are naturally aspirated and many of the old diesels were like this, remember the black smoke........ unburnt diesel fuel and todays Turbo Diesels burn the fuel a lot cleaner so Turbos clean up the air and give more power.
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