I did see your post. From what I gathered, you are of the opinion which supports HALTEC, MOTEC, etc... which is where I sit. However when I refer to it as piggyback, I mean so in the way that you would have to run it together with the stock ECU on these cars if you wish to maintain all the safety features/Body ECU features etc. I just can't see anyone in their right mind running one of these cars solely on a standalone and disabling every other feature of the car. I can see such a thing happening, but we are talking about road legal cars here. I can't imagine passing a safety certificate when your airbag ECU is logging a fault because it isn't communicating properly with the main ECU... amongst other things that can happen when the main ECU is taken out of the equation. The OBDII discussion going on here.... you probably haven't picked up what's really going on yet. Which is understandable because there is more to it than what is seen here (as in the discussion of this extend outside of the forum). I thought my first reply would have showed which direction I was heading in.... but I guess no one really followed. On a side note to this whole discussion, these eBay performance chip threads are a dime a dozen on this forum... and many other forums for that matter. This thread is a result of what you are going to get when something has been discussed so many times that if you aren't going to put the effort in to look for our answers, then we are just going to have some fun.