Cmon, you should know the answer to this John..
The problem with running stock housings is they superheat the air, the more air you try to shove though them the hotter it gets the hotter it gets the less power it makes..
You could pump more into it but it wouldnt be safe and wouldnt give a realistic figure of how much power it is actually making..hence the need for e85 to help keep it cool...Which should work well...ish..
Either way its a pretty good figure though for what it is and the boost it is running,
I bet it feels pretty damn nice to drive as is too, but I think if you keep on the gas to long it will heat up quickly and then it becomes inefficient..
I know mine used to...If hes only gunna do quick sprints here n there it shouldnt matter too much though