get the fidanza. that helped me shaved fraction of second from my 1/4 mile time.
didnt have to adjust my driving style re: moving off, stalling etc, but car does rev up and acceleration way faster (and i had the sr16ve flywheel which was way already lighter than s20de)
the down side to it is that i used to get 242kmh top end, I am now getting about 235kmh
oh, if you get the fidanza, plz remember to count the bolt holes (or take pic and save it) so whenever you are ordering the friction plate you know which one you need.
peace