With this flange you can install a Ford large footprint tonsil style MAF sensor directly in your own tubing. For tonsil style MAFs with the larger bolt pattern such as the SCT BA2600, BA3000, 02-04 Mustang GT and 01-04 Mustang V6. CNCed bare aluminum flange, welding is required, the flange is cut on a 3.5"" radius, welding will fit the gaps when it is used on a tube from 3"" to 4"" in size. Sensor bolt spacing is 2.660"" center to center.