1998 ls1
#5
11 Second Club
iTrader: (29)
Yes you can use a 99 up pcm and wiring harness on a 98 motor. Everything plugs up the same. Only difference is if you get 01-02 pcm and harness. I'm pretty sure they wont have the EGR plug which is no big deal if you have that with your motor. Just take it off. Other than that all the plugs are the same. Good luck with the build. Nice lookin car also.