As far from JBS as possible !
I know personally of anyone who has done more then a basic remap/exhaust/intake on the newer common rail 170 tdi. If you want more power it would be better to get the slightly older PD170 and remove the DPF and remap it to 220-230 bhp.
06 Audi 2.0 PD140 Sport TDI Quattro S-LINE.
Old engine 330 bhp @ flywheel 263 bhp @ wheel 490 lb torque.
Audidriver write up HERE
Now stripped and playing with an uprated Cryo treated engine fitted with bigger turbo,water/methanol,uprated injectors etc etc.Wanting 400 bhp and 500 lb torque.
Other car 500+ bhp MK4 Golf R32 turbo