I might be beating a dead horse, but is the Mexican spec Fiesta ST same as USDM or is it ROTW spec? Logical would dictate that it would be the same as USDM considering the USDM FiST are made there. If this Racechip box thingy is just a MAF module that modifies input to lean or rich, am I correct in saying it won't do anything for an Mexican FiST if it was US spec? and it would be an awful waste of 550 euros?