thanks guys for opinions,

KMFDM, do you know how many misslead results of "WATER FILTER" in a search would come out, 99.9999% are misleaded. I do know what it does, but I don't know if the AEM ones can fit into DIFF intake brands. that's why I asked whether diff CAI system has diff Diameters, and I'm quite sure the answer is yes.

as for the rest, thanks y'all for replying, it's the term that I need to know" Bypass Valve. If I know it, i can just call NOPI right away and ask them.

Thanks again.