They can't be remapped like later ones, but you can fit an ESL daughter board (Search Ebay), which then allows it to be remapped, or you can buy a replacement chip for your ECU as a cheaper alternative.
I am using an Ecilpse Performance chip in my ECU and have been running it for something like 2yrs now. it allows me to run on 97ron fuel, raises boost to 1.1 bar.
the chip is best used with other supporting mods like uprated fuel pump, bigger exhaust etc.
The chip is about £50 whereas the daughter board is more, but allows a map specific to your car with your mods
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