I just put the ark harness in my r33 s2
I had 2 modify both plugs on the harness plug an the ignition plug , I removed both the tags on the side of the ARK plug n on the ignition plug I had to cut a piece out in the middle where the ARK plug is to high but once that is cut out it should slide straight in
Mine works perfect an I also hav an immobilizer doesn't effect it at all I jus lock my car n walk away
Let me kno if you need any other help