Ford reflash the computer to stop the over boost problem. Some cars have had a spike of up to 9 or 10 PSI, so Ford have a reflash to stop it from doing that. The over boosting doesn’t last long, its just a spike, but will produce more power until the boost is brought back to normal. When the boost doesn't spike, the PSI is correct. They haven't decreased the boost, they just stop it from spiking. So they aren't decreasing the boost that you would be using 99% of the time when driving, they are just stopping the over boost that you could have from time to time. I've had mine reflashed and it feels better than ever. Very very smooth now.