a 3 bar map sensor will have 1 bar to vacum and 2 bar to boost but thers people out ther that are running on a 3 bar with over 2 bar off boost so how does that work .as for the 5 bar its 1 bar to vacum and 4 bars to boost whats the advantage off having the 5 bar. if you can runn over 2 bars on a 3 bar map sensor whats the limmit of a 3 bar then