These plates allow the removal of the entire secondary air injection/combi valve system, including the large injection pump on the front of the engine. This results in a much cleaner looking engine bay. We CNC machine these plates from 6061 aluminum alloy and machine them to accept an O ring seal so that they seal up perfectly with no fuss, and no gaskets or messy sealant. nnThis is a complete kit, which includes both block off plates, o rings, and mounting hardware!nnNote about check engine lights: There are two codes which may come up for this, one can be solved by adding a resistor to the circuit for the solenoid control valve, the other- for “incorrect flow detected” can only be defeated by software!