Im just wondering what speed preformance upgrades, and in what order would you advice doing to a 1.9tdi? or is there any point doing it to a tdi, and just save the money to do it on a 2.0?
Also what sort of comprimise to the MPG would it make?
definalty worth doing on a 1.9, depending on if you always take advantage of the power or not mpg should be the same or even a little better, but if you drive it harder all the time then obviously it will be less.
I guess the place to start is with a remap, many companies on here and around, for example Revo, Custom Code etc etc..... going further than a £500 remap will cost much more money you would be looking at intercooler, injector and turbo upgrades, then it gets to a point where you may as well have got the 2.0