If I remember correctly from when I looked in to dbc swap, it depends if you're pcm has an IAC driver. Some didn't apparently. I don't remember what years or boxes did and didn't. I decided it wasn't worth the trouble for my project at the time.

You would probably get a little more help from others if this was in the gm section. It was my understanding the support section was for support using this forum? I could be wrong, not the first time.