Not sure of your smog requirements there, but be aware that you will eliminate your EGR...That's about the only thing holding me back from putting it on (CA smog and haven't decided if manifold swaps every other year are worth it, lol); I played around with mine (some room for improvement while keeping it 'stock') a little and it is tempting to put on. For $50, and esp if it has good gaskets already, it sounds like a good deal. Don't forget to get the bracketry, also...
btw - make sure you get the Cyclone with the dual runners. IIRC, there was a JDM manifold tha thad 'Cyclone' on it, but was single. Also, want to say mine is an RS version (so 3 types) that has a *slightly* bigger plenum. However, could be wrong though; it's been a few years and I'd have to dig thru my notes.