Several Audi, Seat, Skoda and VW model series with . TDI engines use both CR and PD “Pumpe D se” Unit injector technology. RaceChip chip tuning is specially customized to the applicable fuel injection technology with respect to .Mobile ECU Remapping, Car Engine Tuning and Alientech. Here at Mobile ECU Remapping Limited we custom remap every vehicle we work on. Beware some car remapping or chip tuning companies are only able to offer a generic file originally made from another vehicle..