With this flange you can install a Ford small footprint tonsil style MAF sensor directly in your own tubing. For tonsil style MAFs with the smaller bolt pattern such as the older Granatelli/SCT BA2400 and BA2800, Lightning and 03-04 Cobra factory 90MM MAF. CNCed bare aluminum flange, welding is required, the flange is cut on a 3.5"" radius, welding will fill the gaps when it is used on a tube from 3"" to 4"" in size. Sensor bolt spacing is 2.460"" center to center.