I actually went to
BlackTrax - Import & Domestic Tuning - Milpitas, CA.
The previous owner of the car told me the car got tuned by XS engineering in LA already. And Jei from Blacktrax told me that the car was tuned very good already, and he just pull out some fuels in idling.
This is my first turbo car, and Jei from Blacktrax told me that I can't expect to have perfect factory tuning. But I still need to crank 2 to 3 times when I first start the car in cold temperature. Other than that, my car runs fairly well.
I think Blacktrax is pretty honest about their service. Jei only changed me 1 hour of tuning since there is not much to tune. And I do understand that auto shop usually need to charge minimum 1 hr of labor even though they did less than 1 hr of work.