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I have chipped my 1.4 hdi. The box has 2 maps. 1 for economy and 1 for power. The box plugs in series into the fuel rail pressure signal. I know that it is simply increasing fuel pressure earlier than standard but it does work. The car used to be flat above 3000 but it continues pulling now. The economy part simply comes from the fact that I can now use 4th where I would previously have to be in 3rd. Lower speeds but higher gear without labouring the engine.
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