Hello,
For a while now there's been a thread going on at reefcentral about turning your maxijet into something like a tunze stream (http://reefcentral.com/forums/showthread.php?threadid=823609) . I recently tried out this mod on a cheapo (not maxijet) powerhead and am pleased to say that i got results. The powerhead that i used put out about 170 gph and after the conversion is putting out maybe 700 gph (being generous here lol). Here are some pics and a vid, sorry for the bad quality btw. Enjoy :D