Ok so i've managed to get some research done on this EJK thingy. If you want to look for your self try searching for it as a FMF power controller.

It's made by a company called Dobeck from the states and the deisgner of this product was part of power commander in their early days.

Anyway this unit works by taking the injector signal and adjusting it, it doesn't seem to take any readings from anywhere, it's just takes the signal then adds it's value onto the ECU signal, to richen up the mixture that way.

Would this product help with the surging issues on the XT or would it need something like the PC with the MAP grid system?