How is he guessing? Everything stated were facts. The "19ts" are nothing new except using a cheap chinafold instead of machining stock housings. You could buy a similar product YEARS ago. I would he happy to wager that GFs would make much more power in comparison to a China 19t setup with similar mods and same boost and timing levels.
Edit: Lets not derail the thread with another China turbo debate.
LOL beat me to it. I was going to say that nothing I mentioned had anything to do with results. But also for him to let us know when he makes 680whp at 27psi, like someone did with RB GFs
I'll give the 19T chinas a fighting shot to 550whp, but anything over 600 is just a happy dyno.