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The boost from the centrifugal supercharger on this engine transverses through a long pipe and into the top of the engine, where it makes a bend through what is called a hat. This system is generally best for full-race or fuel-injected operations. On carbureted systems, the high speed of the incoming boost often collects on the walls of the hat as the air negotiates the turn into the engine. This may cause uneven fuel distribution.