I think that they discontinued it because sirio just came out with there new .23, which doesn't help you if .18 is a big as you can go. I have the sirio .18 in my maxx and its is awsome! I also have a fantom .18 and it is a really good motor too! last time i checked there were plenty of the sirios on ebay. might want to check that out. And I would recomend the sirio .18 big bore pipe aswell.