So a stock 2006 MCS should be at 10.3 PSI but what should a 2006 JCW car be at?

 

On my '06 JCW in stock form I was getting ~13.5psi.

Then changed to a 15% pulley and got 15psi.

 

I am getting 14.5 PSI, I am not sure if the gauge is accurate.

 

So, what pulley, head, and IC are you running? Of course a smaller pulley will raise the number, and then a high flow head, and some aftermarket intercoolers can lower the number.

If all stock JCW, then either that boost gauge is off a little or your car is on the high side. If it is really 14.5 psi then consider yourself lucky, you have a strong one.

 

Actually, I have stock JCW kit plus Megan racing headers. I can see 14 PSI all the time but sometimes 14.5 PSI