stock turbos. Let's clear this up right away. Even if you think conservatively as Jim Wolf does and think stock injectors max out at 15.5 psi, why put 555's in just to run a couple more psi (where the turbos max out at 18-19 psi anyway). That's the conservative side. I believe with a basic Stage 3 setup running 100+ octane, you can run 17+ psi. I have no doubt that you will not detonate. That's not the question here. The real question is whether the JWT ECU is worth it or not. I don't know of many Z's running 19 psi on stock ECU's. That's one thing I know. Just because you have 1 case, it doesn't scientifically support this theory. People want to be 99.9% sure before they go do something. I'm just saying it's not good advice to run around boosting without the JWT ECU. That's just my opinion.