When I did mine, I used a 96-98 EX floor harness for our 96 hatch. I think I remember researching somewhere that in order for it to be plug-n-play that you need to keep it within your year range (96-98 for 96,97 and 98 and a 99-00 for 99 or 00). It doesn't matter if it's an EX or si, but they...