Increase throttle response and horsepower with our 1986-1993 Mustang Mass Air Meter and Conversion Kits. Our performance BBK and Pro-M mass air flow meters (MAF) come in a variety of sizes including 75mm, 76mm, and 80mm. These meters are calibrated for specific fuel injectors such as 19lb, 24lb, 30lb, 42lb, 47lb and custom sizes. When adding performance to your Fox Body, the MAF will most likely have to be upgraded. Convert your speed density setup to a mass air meter system with a Pro-M mass air conversion wiring harnesses and sensors that will have your motor converted in no time!