toyota_BG if you want to run 2.5 - 2.7 bar (36 - 39psi) you will need at least a 4 BAR map sensor, remember that when a map sensor is a 2 bar it can only read 1 bar of positive pressure likewise a 3 bar can only read 2 bar of positive pressure. The max boost a 3 bar map sensor can read is 2 bar or 29.xx psi.