Has anyone tried this?
http://maxbore.com/index.html

 

look on 247 and mazda3forums for members who have done it. I know on a mostly stock ride it wont do a thing, that and the fact that your looking at possibly running too lean or atleast starting to. With your hypermax you MAY notice something but ill tell you this, its a PITA to get the harness off and then you have to be sure to replace the gasket, its a one time use only.