Why would you chip a V6 TDI? It comes from the factory with 400+ ft-lbs. of torque. It does 0-60 (meaningless stat) in around 7 seconds and will tow 7700 pounds. It already has an eight-speed tranny, a turbocharger, and (being diesel) a sky-high compression ratio. Since it weighs just over 5000 pounds, the few extra horsepower you might get from ordinary engine mods wouldn't make much difference. Spend your money on something like rims if you really must do something to make your vehicle distinctive.
Some like show, some like go.
There are some euro tuners out there, but as far as I know, no easy chipping solution. Custom spooling will tune your ECU, but you have to send it to them. IIRC, it's about 40HP and 90nm of torque. Either way, it's a healthy boost and it does make a difference.