A Normally (or Naturally) Aspirated engine is one which is not turbocharged or supercharged and takes in air for combustion without any additional devices. For example a typical vehicle is normally aspirated. In general a normally aspirated engine is never found in a high performance car, but there are exceptions. For example the BMW M3’s 3.2L normally Aspirated engine produces a magnificent 252 KW of power which is far more than some engines of similar size who are aspirated by a turbo or supercharger. A great deal of power comes from the actual engine design and technology.