i set mine at 12 ish psi but refrained from going all out for any length of time as i knew i would be getting the fuelling setup. you MUST get your fuelling setup when you raise the boost pressure. your tuner will advise what is a safe amount and should set the fuelling to match the desired boost level so that is a/f is at a safe level. lean at wot means melted pistons. best just stick to the 6-7psi until the day before your rolling road session and drive off boost to the tuner.