www.realoem.com has all the part numbers and I did some research before I bought my three stage intake manifold. Also I tested out the disa valves by plugging them in while I still had the single stage manifold. They open and close at the proper rpm regardless of which plug you use. Unplugging them also does not throw a code so that leads me to believe that they are not monitored. I'm just theorizing about the disa valves but it seems logical.