With Std cooler, but aftermarket exhaust, filter and remapped computer i run 13.5psi... its fine... one good thing to do would be to make a duct to your std cooler... thermo wrap the intake pip (the part that goes over the engine...) and put silver around that... should be fine to about 15psi
wouldnt wanna go much over 1 - 1.1bar with std turbo tho