Ok so in order to get the most out of your upgrades on an XB you need to replace the ECU, but there is not many replacments out there. What about a piggy back system. On this other web site they sell these piggy back systems that look like they would do the same thing as replacing the ECU. I am sure that I am missing some thing here, but I am not sure what. The system I am looking at is the "Powerhouse Scion xB Engine Management Piggyback". Is this not what we are looking for. I mean there is 5-6 differnt Piggy back systems on the other site.
What about Stand alone systems. Yeah they are supper expensive, but is this what we need to make our XB upgradable to the max. Of course for that kinda money you could go buy a differnt engine right.