Since you are not in Ca. I can not send you to my guy, I would go with GIAC, or Vivid after that. Vivid has a great price, they own a Panamera turbo and have pretty good Dyno Results. I found the guy I used through a local speed shop reference and after talking with him, It was a no brainer, He wrote most good programs that are being used out there and he knows how a lot of others are doing it and its not necessarily a good way.
Go with Vivid because they can send you the tool to do it yourself through the obdII port. Hope this helps Thanks