hey i got a 93 coupe with a 98 ka motor and trany but its running an s13 ecu still and i have a few questons one should i get an s14 ecu? would it do anything or make amy differnce? the only mods done to it are intake, lsd rear end, exhaust and 2002 altima injectors that are slightly bigger and in a few days it will have headers. And also its running a little rich I was wondering what wouldbe the best thing to tune it with? vafc? safc? afc? Whatever. Can somebody help me out?