i've always wondered the same thing about my iceman CAI. i think the AEM bypass valve comes in different diameters for different applications(civics, accords etc all have different size piping). So, if you're injen or my iceman have the same diameter piping (at some point from the filter to the TB) as one that AEM offers a bypass valve for, i don't see why you couldn't cut it at that point and stick it on there.
You just have to make sure that the diameter of your piping matches the diameter of the AEM bypass valve you are about to buy.
make sense??
