That's a good question, it's supposed to be the MY99 PPP ECU which should run at 1.1bar which is just under 16psi, as you can see from the bottom plot it peaked at 1bar which is 14.5psi. Also has the better Intercooler Pipework
The biggest power gains probably come removing the catalytic converter from the downpipe although the high flow panel filter will certainly help things.