hopefully this will be able to help you man....
i myself just bought a fit, which from what i have gathered, it is similar - if not the same - as the jazz. i have been in and out of this forum (
www.fittuners.com) to gather my information. i use automotiveforums for help on my civic....these guys in here know what they are talking about when it comes to civics, but i havent found much help for the fit in here.
anyways man....check this link out below. i read it and it seems as if it could possibly help you.
http://www.fittuners.com/site/index.php?showtopic=197