I have had the stock clutch in my car for 19,000 turbo miles about 3/4 of it was 5-6 psi and the rest 8 psi. I have been to the track about 4-5 times since then too. And it hasnt slipped yet. I am going to stage 3 and I cant aford to put in the clutch just yet. I am going to run 10 psi for a while untill the clutch finally starts to die then its time to spend $700 for a stage 4 clutch.