3D Engineering 5-Piece Engine Dress-Up Kit for your Supercharged Challenger or Charger Part# MPR-5PC – CNC Machining is a process used in the manufacturing sector that involves the use of computers to control machine tools. Machined from domestic 6061-T6 aluminum. Anodized to your color choice and optional beauty cuts available. Comes with oil fill cap cover, coolant cap cover, supercharger coolant cap cover, washer cap replacement, and bypass valve cover. Oil cap will not fit 2.7L, 6.1L, or dodge Cummins engines.