I have to say that i have not had any problems with dc where i bought my pt turbo from. Since i purchased my pt i have done many mods and they love it, They installed my satge one and even gave me pointers when i installed my wet nitrous kit. I guess it depends on how much they want you as a customer, seems my dealer has no problems with the engine mods and has even asked me to park it at the dealer ship to show people the mods you can do woth a pt.
http://www.finallapgatineau.com/tod.html