http://www.unichip.us/DynoPics/255.jpg
This is a dyno graph of a N/A tundra with the unichip.
As far as getting it reprogrammed... You can send it back to Unichip and have a new program that reflects your new mods put on the chip, it might cost some money though. In the last group buy there threw in 2 free re-tunes with the purchase price. I will see if we can't do something similar.