170’s have major issues with injectors currently at the moment VAG UK are going through replacing faulty injectors and wiring looms, as far as i can see they issued the fix to 58 plated cars onwards, hence why mine seems to be fine (58 plated). if you have any problems with injectors and your car is out of warranty, contact your brand (Seat UK, VW UK, Skoda UK,Audi UK) and tell them the problems you have got etc, aslong as your car has been serviced at the correct times they should pay 100% costs. Alot of people have had this done recently
Not sure about the Turbo lines on 140/170 not heard of it
Coilovers, KW,Eibach are probably best to go for or others such as FK