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I hear ya, personally wouldn't run 27 psi on 8740 arp studs anyways. unless I was running l19 studs you won't see anything over 24 psi without having coolant issues pushing through the head. It alot comes from turbo size too bigger turbo more air velocity. Example. Gt28 30psi isnt the same flow as a 6266 would be. If my tuner says 20psi is max, I trust him over joe anyday. hes tuned my car which is currently on 12 psi on 93 and the man knows his stuff worldwide tuner Martin from rs-enthalpy
False. I had 31psi at 1 point and now I’m running 25 with no problems. I only lifted head at 35psi
 
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