Bought a fgx turbo last year,got given a x4 flash tuner recently and have taken it too a local ford performance shop. For $240 got 2 tunes loaded, 12psi and 14psi.told to go home,charge battery and load it on but after reading some reviews of this shop blowing engines and so on, im a little worried to install anything . Is 14psi safe to run on stock engine? This is my first turbo vehicle so I can really say I have no idea! Confused and need help???