Google Now did seem at first glance to have been developed specifically just for the recently announced Android 4.1 Jelly Bean operating system, but there are people good people over at XDA-Developers did spend the past week or so working hard, and having successfully porting Google Now over to any AOSP-based ROM. In layman’s terms, that would mean any ROM out there, including CyanogenMOD, which was specially built from ground up from the Android Open Source Project – and not by the manufacturer themself.
The entire procedure does seem to be rather complicated in nature, as you will need to replace the Google Search APK in the system folder while making the necessary corrections for the permissions, and all of this will of course, require root access. To date, folks did mention that everything has been working pretty well without missing a beat. Just make sure you know what you are doing beforehand, lest your Android-powered device ends up like a brick.