SPECTRE MAF SENSOR ADAPTER, ALUMINUM, POLISHED -- 4 in. diameter, 3.9 in. length, 3.25 in. width; 3.88 in. x 3.25 in. bolt hole dimension; Allows air intake components or filter to be mounted directly to MAF; Easy bolt-on installation; Fits on Ford vehicles with large MAF adapter; With Spectre's limited 1-year warranty.