Welcome to HDI Tuning, the one and only ECU tuning company to specialise in performance tuning for the Peugeot and Citroen common rail diesel engines. Our remapped software is written in house and tailored to your requirements. Take a look through our website to see the performance upgrades available for your car. www.hdi-tuning.co.uk HDI Tuning Ltd specialise in the Peugeot and Citroen HDI engines plus the Ford and Volvo TDCI PSA derived engines. After 10+ years as a registered Limited company and 12+ years of working with just the HDI engines we know them better than anyone. All remaps are the result of months or even years of research, testing, and development upon the engine they are applied to. This ensures the best possible performance and driveability from our remaps. If you want to see some real feedback check out our excellent reviews on the HDI Tuning Face book page.