As above but the 3 bar refers to its pressure range.

This is 2 bar boost + 1 bar atmosphere = total 3 bar.

1 bar is the same as 14.5 psi roughly


You can ONLY fit one of these if your ecu chip is programmed for it.

The standard car one on a sierra for example is a 2 bar sensor.... 1 bar boost + 1 bar atmosphere


Basically, you change this sensor to allow more boost to be used.