ill add my 2 cents in. PSI has very little to do with safety of the sleeves in a physical sense. The pressure your sleeves see under normal combustion is a lot more than the added pressure from your turbo. what usually happens that blows stock sleeves is leaning out, and letting the hot charge from the turbo predetonate. ITS HEAT, and it will split your sleeves. at the track, my stock sleeves see 28 psi everytime i run, it only hits it for a second and drops down to about 26.5 which i dynoed 515whp at 25 psi on my stock sleeves. ive seen as high as 675whp on stock sleeves with a larger turbo running 27 psi. larger turbo means more volume of air. Your sleeves can handle the power, a great deal of it. they just cant handle the predetonation stress, because it gets everything out of the groove and makes shit wanna come apart. Aftermarket sleeves are basically a fallback to errors in tuning that will cause detonation, or racing in the heat. I recommend sleeves even though im not running them, but I will have golden eagle sleeves for next season.