Has anyone used or heard of RaceChip? They claim to have a plug-in Chip for the common-rail Diesel engine: here is a quote I fund on the link below:
"The principle is simple: Every diesel common-rail vehicle disposes of a so-called common-rail sensor. There is a connection assembly at this sensor where the RaceChip can be simply connected. RaceChip Chiptuning with its digital functionality changes in on-line time the engine management system (up to 25.000 times per second the engine characteristics are optimized). In this way there will be a articulate noticeable increased efficiency."
http://www.racechip.de/Chip-or-Box-15i.html?xPrioS=k1evp5gijbmnfccqq2v4se2a22
"The principle is simple: Every diesel common-rail vehicle disposes of a so-called common-rail sensor. There is a connection assembly at this sensor where the RaceChip can be simply connected. RaceChip Chiptuning with its digital functionality changes in on-line time the engine management system (up to 25.000 times per second the engine characteristics are optimized). In this way there will be a articulate noticeable increased efficiency."
http://www.racechip.de/Chip-or-Box-15i.html?xPrioS=k1evp5gijbmnfccqq2v4se2a22