There nothing on the PD170 of any use to you. Turbo Dynamics and Turbo Active can make a hybrid turbo from your stock turbo which will still be a direct bolt on and good for 230ish BHP.
06 Audi 2.0 PD140 Sport TDI Quattro S-LINE.
Diesel,propane,NOS,hybrid turbo etc..
340bhp 490 lb torque @ flywheel
New Cryo engine with bigger injectors,turbo,water/meth etc fitting now.