I'm not sure about how the psi works, but on my red top sileighty I ran 0.9 kg/cm2 boost with no problems....I had the factory side mount intercooler and a r-32 gt-r fuel pump. the injectore were still 330cc....now on my s-14 black top i'm running 1.0kg/cm2 boost. but i also put a stainless steel ex.manifold, turbo outlet pipe and a down pipe. with a r32 gt-r fuel pump and normal turbine.plus a front mount 2core intercooler. if you want to raise your boost buy a metal head gasket at least 1.2mm
domo
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