So I have been looking around at this for a while now.
http://www.mapecu.co.nz/map2.html
And it seems really tempting. Now we all know that adjusting timing on a piggy back is biatch do to the fact that we have no idea when the stock ECU is pulling or adding timing there for it requires dyno time a knock lite and lots of tuning. Also setting timing using a map type sensor is realy simple cause then you know exacly when you are in boost.
So I was thinking about using this thing, and the time lock device I have mention before on here. And having the Time lock device return the timing to stock at 1psi which is 38* and then just letting the map2ecu do the rest.
It may seem a little pricey but still a lot less then a full stand alone, and at the same time you are still retaining perfect drive ability when not in boost. This also seems like a really good option for the OBD2 guys who have very little good tuning options.