K&N has designed a performance air intake system for the 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003 and 2004 Ford Mustang GT 4.6L. K&N dynamometer tests show an estimated 10.07 horsepower gain at 4945 RPM with use of this K&N air intake modification. K&N tests multiple vehicles for each air intake system it makes to ensure a consistent horsepower and torque gain. This video demonstrates the steps needed to install a power gaining K&N air intake into 1996 through 2004 Ford Mustang GT with the 4.6L engine. http://www.knfilters.com/search/product.aspx?Prod=57-2519-3