ATI plus 2% R53

[JumpingJackFlash]

The factory ECU starts complaining when you go over 20 lbs. boost. Depending on your pulley combination, you can go over this number. I only have a 15% underdrive on my supercharger, but my boost gauge has indicated a peak of 1.2 bar, or roughly 17.40 lbs. boost, at top end. This will increase as you go to a 17% or 19% supercharger underdrive pulley, 1% or 2% crank overdrive pulley, etc. Your total boost will also vary based on altitude.