Spectre Mass Air Flow Sensor Conversion Kits allow you to convert a boot-in stile GM sensor to a drop-in blade style GM mass air flow sensor. These kits are designed for 3 and 5 wire systems, offering a more compact mass air flow sensor design that requires no couplers. This kit requires computer reprogramming to correctly calibrate the mass air flow sensor. A conversion harness, weld-on aluminum mass air flow pad and screws are included to ensure easy installation.