DIESEL TUNING BOXES 1.9dci Engine Are these any good? Well no not in my experience. Admittedly I only spent £60 on mine from . . . . . .ebay. So should I expect any difference. The difference in performance was subtle, and not really worth the hassle. They are easy to fit however, but I did not notice any increase in fuel efficiency. I have removed mine, and I am making do with the 80 hp Renault gave me in the first place.

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