VW TDI's respond very well to a good remap...they use a Bosch EDC15 ECU which can be flashed over the OBDII socket, takes about 20mins. The Standard 115 hp PD engine has massive torque, remapped goes to around 290lb/ft 150hp. The standard turbo is pretty small but with a larger one big HP is possible. I've often thought it would be great fun in a lightweight 2 seater.