No by stage 2 boost I mean the pressure he is running "Stage 2 tune" AKA a 195 chip, nothing to do with staged boost control, I think this is where you are got confused.

I am fully aware of the MAP sensor's purpose, what I said in the first post was "The chip has a predetermined boost limit" which it has, generally speaking remapped chips still have boost limits, although can't speak for ERST.

Martin