In a supercharger there is a belt that connects directly to the engine. It gets its power the same way that the water pump or alternator does. A tuborcharger, on the other hand, gets its power from the exhaust stream. There are tradeoffs between both systems. On the other hand, a turbocharger causes some amount of back pressure in the exhaust system and it also tends to provide less boost until the engine is running at higher RPMs.
Superchargers are easier to install but tend to be more expensive.
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