Hello mate i have had my rs superchipped but mine also wont go over 12-13 psi but this is the way it was made it all depends what type of chip you have and what stage it is also when you fit a superchip you are supposed to buy and fit a -31 actuator otherwise you are just supplying extra fuel without the extra boost needed if you have not already got one go and buy one, get it fitted then get it setup on the rollers you will be suprised at the difference.