There are many companies that are offering plug-in tuning boxes for diesel engines. However when trying to gain better performance from your engine, a full remap is irrefutably the better option. A tuning box sends false sensor values throughout the complete rev-range. This tells the ECU that there is not enough fuel entering the engine, the ECU then over-fuels in order to gain performance. This leads to faster fuel consumption. Although performance gains are made with a plug-in tuning box, they are at the cost of high emissions, higher engine temperatures, and general abuse of the engine. This may result in poor running, black smoke emitting from the exhaust, clogged injectors, rough idle, and engine cut-out. Also over fueling can result in bore washing which will dramatically reduce the life of any engine. When looking at the cost of a full remap compared to a plug-in tuning box, don’t think purely on the cost of the upgrade itself. The future costs that may be incurred through installing a plug-in box are considerably higher than that of a full remap. In fact a full remap creates better performance throughout with increased fuel economy. In the long run a full remap will actually save you money, not cost you more. A full remap will take into account all factors and will deliver much smoother performance with much better gains and again the key thing is this is all dealt with in a completely safe way.