Many Mustang owners want more performance from their pushrod 5.0L, 5.8L, 3.8L, or mod motor 4.6L or 5.4L Mustang exhaust. The X pipe or mid pipe is a good way to free up additional power by creating better exhaust flow by eliminating back pressure on your Mustang. You may gain horsepower but may lose torque. This 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013 Mustang X-pipe is off road which means it comes without catalytic converters for more power and better exhaust flow than your stock or factory Mustang catalytic H-pipe. Since this Mustang X pipe is for off road or race use only, it is illegal to drive on the street and may not pass inspection. Bolt on designs and most are made from Stainless steel for long lasting performance and that great Mustang rumble!