hmmm... If you are a rich guy... then u can try import stuffs from jap or US. There are HKS kits for Jazz/Fit. There's also AJ-Racing's force induction kits. Try Honda FIT and Honda Jazz Forums. they just won race using their induction kits. Good luck...
I'm a newbie driving a FD2R now. Currently, i'm still contemplating between switching to 17inch or retain as 18inch.
I'm not really a hardcore trackie, but occasionally track once a month. But more of daily...