Correct. Had it done on my car when getting a HPFP replaced under warranty, got it back and it only boosts 9psi. I'm getting the tune put back on monday, but I def noticed a mileage decrease on my way home. I normally get 32-33 on this trip in the winter, got 30 this time. Hopefully mileage will return when the tune is back onFrom the stage 1 side of things, I'm like 80% sure it will wipe out your tune and put your ecu back to stock just fyi
They asked me if I wanted the update, as it is supposed to help with some false CEL (or so I was told). My tuner said they'd throw it back on no charge, so I let them throw it on if it helps me avoid issues in the future. I will say it cleared out the p0140/p0141 codes I've had intermittently since I put my exhaust onFunny thing is I went to go get there update along with an oil change and they saw that my car was chipped so they didn't bother with the update.