Your 1985-96 MAT sensor's stock location is near a great deal of heat, causing loss of performance. Our MAT Sensor Relocating Kit moves the sensor to allow cooler ambient temperature readings. Requires drilling a 7/8" hole in the air filter base, simple plug-in install. Hardware included for a 30 minute installation. 1985-91 owners must specify A (gray) or B (black). Instructions included. Tech Note: This is a quick and inexpensive way to gain a little boost in power.