I would almost certainly rule out Dreamscience as most of the people running there maps over here are using they handheld systems which is locked to the car until its unmapped. So if it's not with the car it would be unless.
Where about in the country is the car from originally?
Try tuners local to that area to see if they have any records of the car.
Torquetronix, Auto-tune, there's a revo dealer in Bangor to can't remember there name. Collins performance across the water also seem to be popular over here so they could be worth a shout.
Failing all that best bet I'd have would be put a post on Facebook pages jon44 and such, someone will know the car.