It's pretty new compared to the 3 port I think. If you
really feel like looking, I think there's also there is a 7 port Nova version for around the same price, too. these engines are very difficult if not impossible to find online, so I would ask your local hobby shop (one that sells Novarossi engines). All I know is, I got my Novarossi R21BF2000 6 port (it has a blue head, by the way
) from my favorite local hobby shop for about $180. Good luck with your searching[8D].