For owners of 1996-2004 Mustang GT and 1996-2001 Cobra vehicles, this package is a low cost upgrade to replace everything in front of the factory mass airflow system. It comes complete with MAF adapter, Conical air filter assembly and molded filter cover to hold the assembly in place. Performance is maximized by keeping the filter directly in front of the air meter housing, protecting the filter with the custom shield assembly and drawing the colder air in from the fenderwell. This setup is superior to remotely locating the air filter away from the mass airflow unit, as placing a bend in front of the mass airflow unit can effect the sensors reading. Performance improvement will vary depending on vehicle, with gains ranging anywhere from a low of about 5 HP to a high of about 8 HP at the rear wheels. For an additional boost in performance, you can add one of our trueflow inlet pipes to replace the stock hose that runs between the mass airflow unit and throttle body. Gains provided by the inlet pipe vary, but owners of 1996-1998 Cobra Mustangs may see as much as 7-8 additional rear wheel horsepower due to the extremely resrictive design of the original inlet tube.