You would need a -31 or -34, -31 is normally suffice, it's hard to say specific instructions as some just remove the jets some drill/use bigger to get desired boost. But you need to make sure you get it right otherwise could run to much boost. Easiest way to think if you wanted to run 15PSI and you have a actuator than can handle 10PSI then 5PSI would need bleeding off to achieve.

Martin