Its just the old resistor trick that makes the engine think the air temperature is lower and then adds more fuel. The problem is that most stock Suzukis are a little rich at WOT anyway and secondly the ECU will try to readjust the fuelling to compensate. It certainly can't reprogramme the ECU, that needs a daughterboard to replace the processor to enable it to run with an external memory. I have been working on one of those for the 91on 8V Track/Kicks and Samurais, there are some details here:
http://rhinopower.activeboard.com/t43171026/reverse-engineering-the-8v-tracker-sidekick-and-vitara-ecusThat will give you some idea of what is needed to remap a Samurai.
