Are you looking for a discussion thread or a link to where to find them? I think that there are several companies doing mods for the maxijets. I know that marine depot has the ecomod and the sure-flow mod on their site.
is this the mod you are looking for? just kidding, there are several sites that show how and where to get the mods. google is your friend. you shouldn't pay more than $15 on the mod. that is a resonable price.