I have one of those plug-in boxes, a Panoramiq DTK, which I paid nearly £300 for. Made a hell of a difference to throttle response when fitted, and mpg was marginally better, but I took it off because Direct Line won't insure a car with any mods (unhelpful to$$ers).
I might be persuaded to part with it........................... PM me if you're interested and make me an offer, it's been tried & tested on a 185 D5 and it certainly works.
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VOC Member No 23700
Better to be over the hill than under it 
Current - 2006 XC90 D5 SE Geartronic, 2007 C70 2.0D Sport
Past - 480 1.7, V40 1.8
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