I have just spoken to Mark at TDI. I am having a stage one and stage two upgrade for the GS Sport. the stage 1 upgrade is a different exhaust. the stage 2 is a piggyback ecu unit. Mark was very helpful and informative about the upgrade. The car is booked in for the 23rd of May. Oooh! i'm all excited. I will try to get a before and after readout of performance differences, and let you know.:smilegrin::smilegrin::smilegrin: