The Max boost I would run on the car and this is for track only is 21psi. After that you may watch those stock head bolts start to stretch. Plus you are still working with the weak 2g bottom end which I wouldnt trust past that level. Ive successfully run that boost level on my car and so have a few other TB DSMrs.
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V8 SLAYR
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Jeff Peterson - 2006 GTO - Cold Air Inductions CAI, SLP U/D Pulley, FAST Ported Intake, Ported TB, Kooks 1-7/8's, Spintech Mufflers, H-Pipe, Yella Terra 1.7 Rockers, Flowtech Hellion Cam, 255lph Pump, and GMM Ripshifter. 445rwhp 402rwtq SAE