Increase horsepower and torque in your Fox Body with a performance 1979-1993 Mustang h-pipe & x-pipe. Add power and keep your car emission legal with a catalytic mid pipe that features two high flow converters and larger diameter tubing. Choosing an offroad x-pipe or h-pipe eliminates the catalytic converters for more power and louder exhaust note. Add on a new Motorcraft oxygen sensor to your order to replace damaged or malfunctioning components. These BBK and Pypes parts fit 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986, 1987, 1988, 1989, 1990, 1991, 1992, and 1993 Fox Body Mustang.