The XDP Mass Air Flow (MAF) Sensor XD1024 is an OE-style, direct-fit replacement the factory MAF sensor on your Chevy or GMC 6.6L Duramax LB7/LLY/LBZ. XDP sensors are manufactured from high-quality materials and components to ensure accurate function, response, and communication with the electronics in your truck. Every sensor is engineered and built as a drop-in replacement and comes ready for installation.