depends on conditions, variables, car, and ultimately the pcm
some car will run 10-12psi, stock some run 12-14psi and some will see 14-16psi sometimes. The pcm in these cars can vary the performance based on what it feels it needs to do to achive targeted torque output. I'll save the lecture and say it varies from car to car
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"if you got turbo lag, you ain't drivin' it right!!!" -Carroll Shelby

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I specialize in SRT4 tuning/troubleshooting/repairs.....