I am on my 3rd Subaru now, STi8 PPP, and have never fully understood the whole boost thing.

I appreciate that it is the measure of forced air into the cylinders and that it can vary, or be made to vary, but I do not know what levels of boost you would expect are.


Can anyone help explain what levels you would expect and specifically what levels I might be getting on the STi8 PPP?

Thanks in advance.