Increase the horsepower in your Fox Body with a 1979-93 Mustang Mass Air Meter. These meters come in a wide variety of 73mm, 75mm, 76mm, 80mm, 19lb, 24lb, 30lb, 36lb, 38lb, and 42lb options. Got a speed density setup? Switching over to a mass air setup has always been a popular swap within the Fox Body community. Latemodel Restoration makes it easy with 1979-86 Mustang mass air conversion parts including relays, computers, and wiring harnesses.