The product is a used 1992-1995 Chevy Silverado GMC Sierra 6.5L Diesel Upper Intake Plenum with the part number 10149644. This intake plenum is designed to be installed in the upper part of the engine to improve air and fuel delivery efficiency. Specifically made for diesel engines, this part is essential for maintaining the overall performance and functioning of the vehicle. It is a genuine GM part, ensuring quality and compatibility with the specified vehicle models.