for a mean jap look, you don't slam the car on its ass, that's australian/american, japs have it lowered to a sensible height.
Carbon fibre bonnets look jap and painted OEM look ghetto american.
Fix up that front bar, chopped front bar are lebbo style (i apologise if that term is incorrect)not jap style, they buy yourself a nice front diffuser.
For a true jap look, get a nice looking gt wing or if you are going wingless, go for the drift wing rather than leaving a gap where the orginal wing is suppsoed to be.
This is just my interpretation of a True Jap Look.