u/Psychological-Pay-31

So I've got a ford fiesta mk5 (or 4 facelift) zetec s, 1.6 has 100 hp, well, I was just thinking how tuneable are these ecu's I live in the UK so not really viable for me to import a j3 chip from Australia, but I was wondering if there's a way to read/write the ECU on the cheap, either over obd or j3.