Looking at the various performance upgrades for a TD42T/Ti. for touring/towing applications. What are the various levels of upgrades and rough costs assuming work done by a shop. Lets say a standard motor pumps out 70rwkw:

Quality 3" pipe, tune = +20rwkw, $2k
Aftermarket turbo, tune = +?rwkw, $3k
CC Intercooler = +?rwkw, $2k
Turbo high flow mods = +?rwkw, $?k
Others?

At what point do you need better performing injectors? I see a lot of talk about rwkw but not much about nm. What is the sweet spot for performance upgrades for towing/touring without pouring money down the drain?

Thanks for your input

cheers
Mike