To tell you the truth, I know very little about mods. I plan to get my car in a couple of weeks and do not plan to mod it anytime soon.
Someoe should be able to recommend a shop for you to replace the wastegates. How about call around some of the shops that are already recommended. I'm sure you can save about $1000. I read quickly the info on the Procede and I think there will be an increase in fuel consumption. Unless, you were planning to mod your car anyways.