I wouldn't waste your money on a chip or tuning box, the race chips ones are very expensive and I've had issue with on fitted on a previous car, where it work fone for a few months then kept putting the car in limp mode with overfueling/fuel pressure issues, removed the tuning box and no further issues.
Any decent remap will be better than a chip and not that much more, I got my D3 remapped at a garage I trust and that was £195, and goes to 200bhp, map is brilliant transformed my C30, and not massive amount of black smoke on full throttle.
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