Why not get a 140 GT TDI and map it?
I think most 170 GT TDI's have the GTi front? i may be wrong, i had Revos demo Passatt (170 model Mapped) while
they had my car for MPH last year.
To be honest it was alittle undrivable low down with all the torque, quick midrange though.
Just picked up a facelift A3 2.0 TDI 140 Sport for my otherhalf on Wednesday, will be mapped tomorrow and full s-line kit before
xmas, no mods for the Golf for abit.