if you are changing the injectors it will need setting up, whcih on a 97/98 is a new ecu and remap.. you will gain nothing, you will lose power just adding 440cc injectors as it will be ridiculasly rich on boost.
You would be looking at £50 for dyno and a drink to me to check it with detcans, under the bonnet and talk you through the printouts etc.
Simon
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