What is this Box

[Taliesins]

Do you mean Kg/sq.centimeter. If so then this is around 12.8 PSI so it looks like the boost has been altered. This is about the max you would weant to go.

Nev

Thanks to you Nev and all for the input I think I will leave it as it is then/ dont want to mess things up. There has been a lot of mods made to the surf I have including Lowering and stiffening the suspension I presume to hold the road better (I know this is the opposite to what everyone else ie. raise the suspension) and there are labels stuck on saying 'sport performance by Trick Spot' I cant find any info on these people either.
However the surf is definitely quick off the mark a lot quicker than others i have test driven before purchasing this one. Once again thanks