1g manifold is a downgrade for a 2g. If you want to upgrade, get another 2g manifold and port it, get an Evo 3 manifold and port it- though Mitsu supposedly hiked the prices on them recently so it's not as economical as it once was, or get the Slowboyracing manifold that's just a bit more than an Evo manifold and comes cast in fully ported form.