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...
Installed HKS twin plate (GD pro) recently. Got the ice cream sound when holding the clutch which is norm, but will there be any sound (for example, very soft "eeeee") sound when the car is idle and not holding...