1990-1996 C4 MAT Sensor Relocating Kit Your 1990-1996 MAT Sensors stock location is near a great deal of heat, causing loss of performance. Our Corvette 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. Instructions included. For 1990-1996 ZR-1/LT1 30 Minutes for a Better Performing Engine MADE IN THE USA