Don't bother with 'tuning boxes' invariably a con job. A proper remap on the other hand done be a reputable tuner can transform a car. It won't be cheap but that's up to you. Don't expect miracles however, you're starting from a lowish base and there are (sensible) limits. A good tuner will lay out the options and both the upside and downside. Good luck.
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Non bowus drawi, non ridus horsi, non snoutus injecti!
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