Look at "welding tips" not many welding/hardware stores will have them but I switched mine out from Z1's .035's to .045's or the closest thing. I was boosting 17 psi w/ the .035's and after the .045's were installed I boost 14 ish. Not to discredit Ash's top notch work or Z1's because I know the said they ALWAYS use .035's and boost 15. I was told that I'm the one w/ the boost leak or something. My friend bought one of their 1st ECU's back when ASH was just working on these himself and his were .045's and he has the healthiest running Z I've seen so I know if he had .035's he would have been overboosting too.
"Be kind, for everyone you meet is fighting a harder battle" ~ Plato