I don't know and still don't, but am curious myself. Since there were no replies so far, I googled to see what I could find. It looks like a very involved process that includes removing the top of the engine, including the intake manifold. Google "mustang cmrc plug". Down near the bottom of the first page should be one titled "cmcv delete plate install". It has a detailed pictorial of an install. It says cmrc, cmvc, and other acronyms are the same thing.